login
A080325
Multiple of coefficients in expansion of 1/sin(x)^2.
0
0, 1, 12, 320, 16128, 1382400, 186802176, 37571788800, 10752302776320, 4222605695385600, 2209155036594831360, 1502185604799843532800, 1300250162749167894528000, 1407357631537525272084480000
OFFSET
0,3
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
KEYWORD
nonn,easy
AUTHOR
Michael Somos, Feb 14 2003
STATUS
approved