A081353 - OEIS

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A081353

Diagonal of square maze arrangement of natural numbers A081349.

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; refs; listen; history; internal format)

	OFFSET	`0,1`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 0..10000`
	FORMULA	`a(n) = (n+1)(n+2)+(-1)^n = 2C(n+2,2)+(-1)^n.`
	PROG	`(MAGMA) [(n + 1)*(n + 2) + (-1)^n: n in [0..50]]; // Vincenzo Librandi, Sep 06 2011`
	CROSSREFS	`Cf. A081350, A081351, A081352.` `Sequence in context: A157974 A019420 A019358 * A024820 A038941 A141215` `Adjacent sequences: A081350 A081351 A081352 * A081354 A081355 A081356`
	KEYWORD	`nonn,easy`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 19 2003`

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Last modified February 15 03:22 EST 2012. Contains 205694 sequences.