id:A086955 - OEIS Search Results

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n^2+2n+2-(-1)^n.

+0
3

1, 6, 9, 18, 25, 38, 49, 66, 81, 102, 121, 146, 169, 198, 225, 258, 289, 326, 361, 402, 441, 486, 529, 578, 625, 678, 729, 786, 841, 902, 961, 1026, 1089, 1158, 1225, 1298, 1369, 1446, 1521, 1602, 1681, 1766, 1849, 1938, 2025, 2118, 2209, 2306, 2401, 2502 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(2n)=A016754(n).`
	FORMULA	`G.f.: (1+4x-3x^2+2x^3)/((1+x)(1-x)^3)); a(2n)=(2n+1)^2; a(2n+1)=4n^2+8n+6.`
	CROSSREFS	`Cf. A080335.` `Sequence in context: A020183 A039280 A045091 this_sequence A078415 A023041 A118277` `Adjacent sequences: A086952 A086953 A086954 this_sequence A086956 A086957 A086958`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 25 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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