

A109851


a(1) = 1, a(2) = 2; for n > 2, sum of absolute differences of all combinations of pairs of previous terms.


0



1, 2, 1, 2, 4, 14, 74, 494, 3854, 34094, 336494, 3662894, 43579694, 562498094, 7827355694, 116800219694, 1860366043694, 31500985051694, 565032127195694, 10702123827931694, 213443957842651694, 4471022472151771694, 98137749786952411694, 2252472478027367131694
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OFFSET

1,2


COMMENTS

The final digits approach a limit. That is, after the first few terms, all the terms end in 70194710743368411694 and as more terms go by, even more digits remain constant.  Joshua Zucker, May 04 2006


LINKS

Table of n, a(n) for n=1..24.


FORMULA

a(n+1) = a(n) + sum [ absolute{a(n)  a(k)}, k = 1 to n].


EXAMPLE

14 is the next term after 4= a(5), 14 = 4 + abs(4a(1)) + abs(4a(2)) + abs( 4a(3)) + abs(4a(4)).


CROSSREFS

Sequence in context: A095067 A225564 A032259 * A245841 A011404 A002211
Adjacent sequences: A109848 A109849 A109850 * A109852 A109853 A109854


KEYWORD

nonn


AUTHOR

Amarnath Murthy, Jul 06 2005


EXTENSIONS

More terms from Joshua Zucker, May 04 2006
Corrected by Charles R Greathouse IV, Jun 08 2015


STATUS

approved



