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Search: id:A081351
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A081351 First row in square maze array of natural numbers A081349. +0
5
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; listen)
OFFSET

0,2

COMMENT

Interleaves the odd squares A016754 with 8 times the triangular numbers A000217.

FORMULA

a(n)= (n+1)(n+2)-(n+1)(-1)^n = 2C(n+2, 2)-C(n+1, 1)(-1)^n.

CROSSREFS

Cf. A081350, A081352.

Sequence in context: A048124 A046258 A074344 this_sequence A032462 A077599 A109097

Adjacent sequences: A081348 A081349 A081350 this_sequence A081352 A081353 A081354

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 19 2003

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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