A152801 a(n) = A152800(n+1,2n) for n>=0.

1, 2, 5, 21, 87, 378, 1682, 7596, 34688, 159724, 740243, 3448579, 16134813, 75760294, 356811308, 1684882778, 7974184903, 37815280813, 179644013528, 854749753320, 4072634928710, 19429522879905, 92799859650401

Offset: 0

Author

Paul D. Hanna, Dec 26 2008

Keywords

• nonn

Comments

Triangle A152800 gives a q-analog of the Euler numbers.

Crossrefs

Cf. A152800; A152802.

Programs

PARI

{a(n)=polcoeff(polcoeff(1/sum(m=0,n+1,(-1)^m*x^(2*m)/prod(j=1,2*m,(q^j-1)/(q-1))+x*O(x^(2*n+2))),2*n+2,x)*prod(j=1,2*n+2,(q^j-1)/(q-1)),2*n,q)}