A081351 - OEIS

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A081351

First row in square maze array of natural numbers A081349.

1, 8, 9, 24, 25, 48, 49, 80, 81, 120, 121, 168, 169, 224, 225, 288, 289, 360, 361, 440, 441, 528, 529, 624, 625, 728, 729, 840, 841, 960, 961, 1088, 1089, 1224, 1225, 1368, 1369, 1520, 1521, 1680, 1681, 1848, 1849, 2024, 2025, 2208, 2209, 2400, 2401, 2600 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Interleaves the odd squares A016754 with 8 times the triangular numbers A000217.`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 0..10000`
	FORMULA	`a(n) = (n+1)(n+2)-(n+1)(-1)^n = 2C(n+2,2)-C(n+1,1)(-1)^n.`
	PROG	`(MAGMA) [(n+1)(n+2)-(n+1)(-1)^n: n in [0..50]]; // Vincenzo Librandi, Sep 06 2011`
	CROSSREFS	`Cf. A081350, A081352.` `Sequence in context: A048124 A046258 A074344 * A032462 A077599 A109097` `Adjacent sequences: A081348 A081349 A081350 * A081352 A081353 A081354`
	KEYWORD	`nonn,easy`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 19 2003`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.