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Search: id:A047990
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A047990 a(n+1)=a(n)+(n^2+1)*a(n-1). +0
2
1, 2, 4, 14, 54, 292, 1696, 12500, 97300, 909800, 8888400, 100778200, 1185163000, 15798002000, 217275712000, 3329482106000, 52433793018000, 908110694260000, 16113910669480000, 311249886303980000, 6144485548655740000 (list; graph; listen)
OFFSET

0,2

REFERENCES

Studied by M. Bhargava (bhargava(AT)math.Princeton.EDU) and H. S. Wilf.

LINKS

T. D. Noe, Table of n, a(n) for n=0..100

CROSSREFS

Cf. A047991.

Adjacent sequences: A047987 A047988 A047989 this_sequence A047991 A047992 A047993

Sequence in context: A038055 A006385 A131180 this_sequence A000939 A109154 A030853

KEYWORD

nonn,easy,nice

AUTHOR

njas

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.


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