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A033466 First differences of sequence {1/(n^2+1)} (denominators). 1
2, 10, 10, 170, 442, 962, 1850, 650, 5330, 8282, 12322, 17690, 986, 33490, 44522, 58082, 74530, 18850, 117650, 145162, 177242, 214370, 51410, 305810, 361202, 423802, 494210, 114610, 660970, 758642 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..29.

FORMULA

For all n not in A016873, a(n) = n^4 + 2n^3 + 3n^2 + 2n + 2, else A099024((n-2)/5). - Ralf Stephan, Sep 25 2004

CROSSREFS

Sequence in context: A067046 A066394 A232500 * A193181 A222638 A299982

Adjacent sequences:  A033463 A033464 A033465 * A033467 A033468 A033469

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified June 16 12:38 EDT 2019. Contains 324152 sequences. (Running on oeis4.)