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 A121835 #11 May 10 2024 18:31:18 %S A121835 1,1,6,540,1360800,154314720000,1154953090368000000, %T A121835 786615912769073587200000000,64289841661815089567953305600000000000, %U A121835 803921077736369993656026249310037606400000000000000 %N A121835 Hankel transform of A014307. %H A121835 Georg Fischer, <a href="/A121835/b121835.txt">Table of n, a(n) for n = 0..24</a> %F A121835 a(n) = A000178(n)*A057863(n). %Y A121835 Cf. A014307. %Y A121835 Cf. A000178, A057863. %K A121835 nonn %O A121835 0,3 %A A121835 _Philippe Deléham_, Aug 28 2006 %E A121835 a(7), a(8) corrected and more terms from _Georg Fischer_, May 10 2024