This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A152806 #4 Mar 30 2012 18:37:15
%S A152806 1,1,2,6,14,44,148,544,2400,13268,73016,519252,3391406,30119132,
%T A152806 226113492,2402746648,20167617670,252482755188,2329941443632,
%U A152806 33731346482920,336826566536064,5581686585375024,59708797929080240
%N A152806 Unsigned row sums of triangle A152805.
%C A152806 Triangle A152805 lists coefficients of a q-analog of the tangent numbers (A000182).
%H A152806 Paul D. Hanna, <a href="/A152806/b152806.txt">Table of n, a(n), n=0..50.</a>
%o A152806 (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)))}
%Y A152806 Cf. A152805, A152807.
%K A152806 nonn
%O A152806 0,3
%A A152806 _Paul D. Hanna_, Dec 28 2008