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

0,2

Comments

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

Links

Table of n, a(n) for n=0..22.

Prog

(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)}

Crossrefs

Cf. A152800; A152802.

Sequence in context: A242785 A359672 A228385 * A062297 A357791 A047104

Adjacent sequences: A152798 A152799 A152800 * A152802 A152803 A152804

Keyword

nonn

Author

Paul D. Hanna, Dec 26 2008

Status

approved