id:A086372 - OEIS Search Results

Search: id:A086372

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First differences of A027349.

+0
1

-1, 0, 1, -1, 1, -1, 1, 0, 0, 0, 0, 1, -1, 1, 0, 1, -1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 2, 0, 1, 0, 2, 1, 1, 0, 3, 1, 1, 1, 3, 2, 1, 2, 3, 3, 2, 2, 4, 5, 1, 4, 5, 5, 3, 5, 6, 7, 4, 6, 8, 9, 5, 8, 11, 10, 8, 10, 13, 13, 11, 12, 17, 17, 13, 16, 22, 19, 19, 20, 26, 26, 23, 25, 33, 32, 29 (list; graph; listen)

	OFFSET	`1,27`
	COMMENT	`Sequence has the same parity as A000041, the partition numbers, i.e. a(n) is congruent A040051(n) mod 2 (proved by James Sellers using generating functions).`
	PROGRAM	`(PARI) a(n)=polcoeff((1-x)prod(k=1, n, 1+x^(2k+1), 1+x*O(x^n)), n)`
	CROSSREFS	`Sequence in context: A110914 A127505 A138036 this_sequence A089650 A085513 A036579` `Adjacent sequences: A086369 A086370 A086371 this_sequence A086373 A086374 A086375`
	KEYWORD	`sign,easy`
	AUTHOR	`Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 06 2003`

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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