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A093722 Integers of the form (n^2-1)/120. +0
3
0, 1, 3, 7, 8, 14, 20, 29, 31, 42, 52, 66, 69, 85, 99, 118, 122, 143, 161, 185, 190, 216, 238, 267, 273, 304, 330, 364, 371, 407, 437, 476, 484, 525, 559, 603, 612, 658, 696, 745, 755, 806, 848, 902, 913, 969, 1015, 1074, 1086, 1147, 1197, 1261, 1274, 1340 (list; graph; listen)
OFFSET

0,3

FORMULA

a(-1-n)=a(n).

PROGRAM

(PARI) {a(n)= (((n\4*3 +n%4)*10+ (-1)^(n\2))^2 -1)/120 } /* Michael Somos Oct 17 2006 */

CROSSREFS

Cf. A002381.

Cf. a(n)=(A057538(n)^2-1)/120.

Sequence in context: A106474 A127441 A067064 this_sequence A002381 A131559 A051211

Adjacent sequences: A093719 A093720 A093721 this_sequence A093723 A093724 A093725

KEYWORD

nonn

AUTHOR

Michael Somos, Apr 13 2004

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.


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