id:A159790 - OEIS Search Results

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Toothpick number A139250(n) minus triangular number A000217(n).

+0
4

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; listen)

	OFFSET	`0,7`
	LINKS	`OEIS Plot 2, Triangular numbers and toothpick numbers vs n`
	MAPLE	`nmax := 300 ; read("transforms3") ; a250 := BFILETOLIST("b139250.txt") ; a217 := [seq(n*(n+1)/2, n=0..nmax)] ; for n from 1 to nmax do printf("%d, ", op(n, a250)-op(n, a217)) ; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 04 2009]`
	CROSSREFS	`Sequence in context: A021787 A011052 A153738 this_sequence A016639 A138341 A153520` `Adjacent sequences: A159787 A159788 A159789 this_sequence A159791 A159792 A159793`
	KEYWORD	`sign`
	AUTHOR	`Omar E. Pol (info(AT)polprimos.com), May 03 2009`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 04 2009`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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