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A163312
Row sums of triangle A163311
1
1, 3, 8, 17, 34, 64, 114, 195, 325, 529, 840, 1303, 1977, 2940
OFFSET
1,2
COMMENTS
Triangle A163311 by diagonals = the infinite set of Toothpick sequences.
LINKS
David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]
FORMULA
a(n) = sum of n-th row terms, triangle A163311
EXAMPLE
a(4) = 17 = (1, + 4 + 7, + 5).
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Jul 24 2009
STATUS
approved