id:A013610 - OEIS Search Results

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Triangle of coefficients in expansion of (1+3x)^n.

+0
8

1, 1, 3, 1, 6, 9, 1, 9, 27, 27, 1, 12, 54, 108, 81, 1, 15, 90, 270, 405, 243, 1, 18, 135, 540, 1215, 1458, 729, 1, 21, 189, 945, 2835, 5103, 5103, 2187, 1, 24, 252, 1512, 5670, 13608, 20412, 17496, 6561, 1, 27, 324, 2268, 10206, 30618, 61236, 78732 (list; table; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Mirror image of A027465. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Nov 25 2007`
	FORMULA	`G.f.: 1 / [1 - x(1+3y)].`
	PROGRAM	`(PARI) T(n, k)=polcoeff((1+3*x)^n, k)`
	CROSSREFS	`The rows of A013610 are the rows of A027465 reversed.` `Cf. A007318, A013609, A027465, etc.` `Sequence in context: A103407 A074475 A049410 this_sequence A008573 A089710 A065918` `Adjacent sequences: A013607 A013608 A013609 this_sequence A013611 A013612 A013613`
	KEYWORD	`tabl,nonn,easy`
	AUTHOR	`njas`

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Last modified July 19 08:04 EDT 2008. Contains 142098 sequences.

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