A129205 From Wendt's determinant compute (A048954(2*n)/(1-4^n))^(1/2).

1, 5, 0, 2295, 453871, 0, 545539395584, 4883188189089105, 0, 14214363393075742724609375, 5968603205606800870499639536231, 0, 41302584753289717847206700750464023881130441

Offset: 1

Author

Michael Somos, Apr 03 2007

Keywords

• nonn

References

• P. Ribenboim, 13 Lectures on Fermat's last theorem, Springer-Verlag, NY, 1979, page 62. MR0551363 (81f:10023)

Crossrefs

Cf. A048954, A215615, A215616.

Programs

PARI

{a(n)= if(n<1, 0, n*=2; sqrtint( matdet( matrix( n, n, i, j, binomial( n, (j-i)%n )))/ (1-2^n)))}

Formula

a(n)=0 if and only if n is divisible by 3.

a(n) = A215615(2*n). - Jonathan Sondow, Aug 17 2012