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Search: id:A055426
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A055426 Number of points in Z^n of norm <= 2. +0
1
1, 5, 13, 33, 89, 221, 485, 953, 1713, 2869, 4541, 6865, 9993, 14093, 19349, 25961, 34145, 44133, 56173, 70529, 87481, 107325, 130373, 156953, 187409, 222101, 261405, 305713, 355433, 410989, 472821, 541385, 617153, 700613, 792269, 892641 (list; graph; listen)
OFFSET

0,2

FORMULA

1/3 * (2n^4-8n^3+6n^2+2n+3).

CROSSREFS

Sequence in context: A100227 A027051 A109786 this_sequence A146621 A147086 A032406

Adjacent sequences: A055423 A055424 A055425 this_sequence A055427 A055428 A055429

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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


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