A130409 - OEIS

%I #4 Jul 07 2015 22:03:20

%S 1,1,3,4,15,3,84,3,5,20,33,6,5460,210,12,48,255,45,1596,105,2310,1320,

%T 138,36,9100,546,756,112,435,30,114576,42,58905,140,105,18,767676,

%U 3458,16380,1680,15785,385,132440,990,434700,38640,3948,360,3248700,99450

%N Denominators of a-sequence for Sheffer matrix A130191 (Stirling2 squared).

%C The numerators are found in A130408.

%C See the W. Lang link in A130408.

%F a(n)=denominator(r(n)),n>=0, with the rational r(n) sequence with e.g.f. x/log(1+log(1+x)).

%K nonn,frac,easy

%O 0,3

%A _Wolfdieter Lang_ Jun 01 2007