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 A297630 #9 Jan 10 2018 16:14:22
%S A297630 1,2,5,20,137,1478,22925,481448,13138193,451749962,19104365333,
%T A297630 974417603132,58981977530777,4179837144348686,342799255549127837,
%U A297630 32212592211380729168,3438255899105307857441,413670348773363088131474,55722273751954119897519653
%N A297630 Row sums of A297628.
%C A297630 Apparently (apart from offset) the same as A297629, essentially column 1 of A297628 - _R. J. Mathar_, Jan 09 2018
%o A297630 (Julia)
%o A297630 function A297630List(len::Int)
%o A297630 R = Array{BigInt}(len)
%o A297630 A = fill(BigInt(0), len+1); A[1] = 1
%o A297630 for n in 1:len
%o A297630 for k in n:-1:2 A[k] += A[k+1] end
%o A297630 for k in 2: 1:n A[k] += A[k-1] end
%o A297630 R[n] = sum(A[1:n])
%o A297630 end
%o A297630 return R
%o A297630 end
%o A297630 println(A297630List(19))
%Y A297630 Cf. A297628, A297629.
%K A297630 nonn
%O A297630 0,2
%A A297630 _Peter Luschny_, Jan 02 2018