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A152806
Unsigned row sums of triangle A152805.
3
1, 1, 2, 6, 14, 44, 148, 544, 2400, 13268, 73016, 519252, 3391406, 30119132, 226113492, 2402746648, 20167617670, 252482755188, 2329941443632, 33731346482920, 336826566536064, 5581686585375024, 59708797929080240
OFFSET
0,3
COMMENTS
Triangle A152805 lists coefficients of a q-analog of the tangent numbers (A000182).
LINKS
PROG
(PARI) {a(n)=sum(k=0, n*(n-1)/2, abs(polcoeff(polcoeff(2/(1+sum(m=0, n, (2*x)^m/prod(j=1, m, (q^j-1)/(q-1))+x*O(x^(n+2)))), n, x)*prod(j=1, n, (q^j-1)/(q-1)), k, q)))}
CROSSREFS
Sequence in context: A151386 A151399 A299042 * A366223 A122109 A133155
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Dec 28 2008
STATUS
approved