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 A187044 #17 May 10 2023 08:22:32
%S A187044 1,2,4,9,22,59,170,525,1716,5917,21362,80533,315516,1281913,5383622,
%T A187044 23330405,104084736,477371217,2246811730,10839493637,53528916508,
%U A187044 270318789249,1394426035918,7341439399397,39413238225512,215607783811041
%N A187044 Row sums of number triangle A070895.
%H A187044 G. C. Greubel, <a href="/A187044/b187044.txt">Table of n, a(n) for n = 0..795</a>
%F A187044 E.g.f.: exp(x+x^2/2)*(sqrt(pi/2)*ERF(x/sqrt(2)) + 1).
%F A187044 Conjecture: a(n) -2*a(n-1) +(2-n)*a(n-2) +(n-2)*a(n-3)=0. - _R. J. Mathar_, Sep 29 2012
%F A187044 a(n) ~ (sqrt(2)+sqrt(Pi))/2 * exp(sqrt(n)-n/2-1/4)*n^(n/2) * (1+7/(24*sqrt(n))). - _Vaclav Kotesovec_, Aug 15 2013
%F A187044 a(n) = A193361(n+2). - _Vaclav Kotesovec_, Feb 14 2014
%t A187044 CoefficientList[Series[E^(x+x^2/2)*(Sqrt[Pi/2]*Erf[x/Sqrt[2]]+1), {x, 0, 20}], x]* Range[0, 20]! (* _Vaclav Kotesovec_, Aug 15 2013 *)
%Y A187044 Cf. A070895, A193361.
%K A187044 nonn,easy
%O A187044 0,2
%A A187044 _Paul Barry_, Mar 02 2011