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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 (list; graph; refs; listen; history; text; internal format)
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(4-a(1)) + abs(4-a(2)) + abs( 4-a(3)) + abs(4-a(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

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Last modified March 26 18:36 EDT 2019. Contains 321511 sequences. (Running on oeis4.)