id:A081353 - OEIS Search Results

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Diagonal of square maze arrangement of natural numbers A081349.

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3, 5, 13, 19, 31, 41, 57, 71, 91, 109, 133, 155, 183, 209, 241, 271, 307, 341, 381, 419, 463, 505, 553, 599, 651, 701, 757, 811, 871, 929, 993, 1055, 1123, 1189, 1261, 1331, 1407, 1481, 1561, 1639, 1723, 1805, 1893, 1979, 2071, 2161, 2257, 2351, 2451, 2549 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n)=(n + 1)(n + 2) + (-1)^n=2C(n+2, 2)+(-1)^n.`
	CROSSREFS	`Cf. A081350, A081351, A081352.` `Sequence in context: A157974 A019420 A019358 this_sequence A024820 A038941 A141215` `Adjacent sequences: A081350 A081351 A081352 this_sequence A081354 A081355 A081356`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 19 2003`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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