id:A081346 - OEIS Search Results

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First column in maze arrangement of natural numbers A081344.

+0
3

1, 2, 9, 10, 25, 26, 49, 50, 81, 82, 121, 122, 169, 170, 225, 226, 289, 290, 361, 362, 441, 442, 529, 530, 625, 626, 729, 730, 841, 842, 961, 962, 1089, 1090, 1225, 1226, 1369, 1370, 1521, 1522, 1681, 1682, 1849, 1850, 2025, 2026, 2209, 2210, 2401, 2402, 2601 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Interleaves odd squares A016754 with central polygonal numbers A001844.`
	FORMULA	`a(n)=n^2+n+1+n(-1)^n, a(2n)=A016754(n), a(2n+1)=2*A001844(n).`
	CROSSREFS	`Cf. A081345.` `Sequence in context: A046975 A005695 A079747 this_sequence A058551 A119183 A073082` `Adjacent sequences: A081343 A081344 A081345 this_sequence A081347 A081348 A081349`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 19 2003`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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