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A159790 Toothpick number A139250(n) minus triangular number A000217(n). 3
0, 0, 0, 1, 1, 0, 2, 7, 7, 2, 0, 1, 1, 4, 18, 35, 35, 22, 12, 5, -3, -8, -2, 7, 3, -6, -4, 5, 17, 48, 106, 155, 155, 126, 100, 77, 53, 32, 22, 15, -5, -30, -44, -51, -55, -40, 2, 35, 23, -10, -32, -47, -59, -52, -18, 11, 11, 14, 48, 101, 181, 328, 522, 651, 651, 590, 532 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

Table of n, a(n) for n=0..66.

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

OEIS Plot 2, Triangular numbers and toothpick numbers vs n

CROSSREFS

Sequence in context: A021787 A011052 A153738 * A251809 A016639 A138341

Adjacent sequences:  A159787 A159788 A159789 * A159791 A159792 A159793

KEYWORD

sign

AUTHOR

Omar E. Pol, May 03 2009

EXTENSIONS

More terms from R. J. Mathar, May 04 2009

STATUS

approved

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Last modified October 21 20:22 EDT 2018. Contains 316428 sequences. (Running on oeis4.)