id:A081352 - OEIS Search Results

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Main diagonal of square maze arrangement of natural numbers A081349.

+0
6

1, 7, 11, 21, 29, 43, 55, 73, 89, 111, 131, 157, 181, 211, 239, 273, 305, 343, 379, 421, 461, 507, 551, 601, 649, 703, 755, 813, 869, 931, 991, 1057, 1121, 1191, 1259, 1333, 1405, 1483, 1559, 1641, 1721, 1807, 1891, 1981, 2069, 2163, 2255, 2353, 2449, 2551 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=(n + 1)(n + 2) - (-1)^n=2C(n+2, 2)-(-1)^n.`
	CROSSREFS	`Cf. A081350, A081351, A054569.` `Adjacent sequences: A081349 A081350 A081351 this_sequence A081353 A081354 A081355` `Sequence in context: A106674 A076854 A035704 this_sequence A039511 A103667 A033207`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 19 2003`

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Last modified October 11 09:12 EDT 2008. Contains 144832 sequences.

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