A152806 Unsigned row sums of triangle A152805.

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

Author

Paul D. Hanna, Dec 28 2008

Keywords

• nonn

Comments

Triangle A152805 lists coefficients of a q-analog of the tangent numbers (A000182).

Links

• Paul D. Hanna, Table of n, a(n), n=0..50.

Crossrefs

Cf. A152805, A152807.

Programs

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)))}