A080325 Multiple of coefficients in expansion of 1/sin(x)^2.

0, 1, 12, 320, 16128, 1382400, 186802176, 37571788800, 10752302776320, 4222605695385600, 2209155036594831360, 1502185604799843532800, 1300250162749167894528000, 1407357631537525272084480000

Offset

0,3

Links

Table of n, a(n) for n=0..13.

Prog

(PARI) a(n)=if(n<1, 0, (n+1)!*(2*n+1)!/4*polcoeff(1/sin(x+O(x^(2*n+2)))^2, 2*n-2))

Crossrefs

Sequence in context: A279293 A180790 A277072 * A083431 A239781 A288032

Adjacent sequences: A080322 A080323 A080324 * A080326 A080327 A080328

Keyword

nonn,easy

Author

Michael Somos, Feb 14 2003

Status

approved