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 A118677 #3 Mar 30 2012 17:26:53
%S A118677 1,2,6,18,60,202,718,2600,9748,37270,146058,582548,2367028,9761890,
%T A118677 40844168,173001018,741193056,3207480526,14008373662,61683982696,
%U A118677 273658651700,1222314257450,5493414465900,24828463984518
%N A118677 Number of Motzkin paths of length n in 3D with no level steps at odd level.
%F A118677 EXPCONV of A090344 with itself, i.e. a(n) = sum_{k=0}^n binomial(n,k)*A090344(k)*A090344(n-k)
%Y A118677 Cf. A090344.
%K A118677 nonn
%O A118677 0,2
%A A118677 _Max Alekseyev_, May 19 2006