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

1,2

References

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

Links

Table of n, a(n) for n=1..13.

Formula

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

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

Prog

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

Crossrefs

Cf. A048954, A215615, A215616.

Sequence in context: A226156 A215616 A249737 * A327581 A098173 A180977

Adjacent sequences: A129202 A129203 A129204 * A129206 A129207 A129208

Keyword

nonn

Author

Michael Somos, Apr 03 2007

Status

approved