

A157576


Half the number of length n integer sequences with sum zero and sum of squares 3872.


1



1, 3, 66, 14630, 1446495, 105717843, 6111518987, 323657828739, 16777260176400, 835056998169955, 40377792647031081, 1902059925519314067, 85804943707548960986, 3683698658760163764945, 151229533594426205964390
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OFFSET

2,2


LINKS



FORMULA

[cache enabling] count(n,s,ss)>count(n,t,tt) where t=s mod n, q=(ts)/n, tt=ss+2*q*s+n*q^2; count(n,t,tt)=sum[i^2<=tt]{ count(n1,ti,tti^2) }. a(n)=count(n,0,3872)/2.


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



