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A157598
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Half the number of length n integer sequences with sum zero and sum of squares 8712.
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1
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1, 3, 198, 27930, 3388365, 475265259, 48238917727, 3831384879156, 290324159283540, 21674347016566915, 1571698374562433667, 110138942653526323056, 7411777323163714916688, 477289870722013730288040
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,2
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LINKS
| R. H. Hardin, Table of n, a(n) for n=2..50
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FORMULA
| [cache enabling] count(n,s,ss)->count(n,t,tt) where t=s mod n, q=(t-s)/n, tt=ss+2*q*s+n*q^2; count(n,t,tt)=sum[i^2<=tt]{ count(n-1,t-i,tt-i^2) }. a(n)=count(n,0,8712)/2.
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CROSSREFS
| Sequence in context: A101382 A000724 A157565 * A023310 A054701 A140654
Adjacent sequences: A157595 A157596 A157597 * A157599 A157600 A157601
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net) Mar 02 2009
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