id:A053439 - OEIS Search Results

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Expansion of (1+x+2*x^3)/((1-x)*(1-x^2)^2).

+0
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1, 2, 4, 8, 11, 18, 22, 32, 37, 50, 56, 72, 79, 98, 106, 128, 137, 162, 172, 200, 211, 242, 254, 288, 301, 338, 352, 392, 407, 450, 466, 512, 529, 578, 596, 648, 667, 722, 742, 800, 821, 882, 904, 968, 991, 1058, 1082, 1152, 1177, 1250, 1276 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`Even: a(2n)= 2 n^2 +n +1, odd: a(2n-1)= 2 n^2. - Frank Ellermann, Feb 11, 2002` `a(n)=sum{k=0..n, C(n, mod(k, 2)) } - Paul Barry (pbarry(AT)wit.ie), Jul 24 2003`
	CROSSREFS	`Adjacent sequences: A053436 A053437 A053438 this_sequence A053440 A053441 A053442` `Sequence in context: A010068 A120632 A007295 this_sequence A033956 A053437 A018277`
	KEYWORD	`nonn`
	AUTHOR	`njas, Jan 12 2000`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

AT&T Labs Research