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 A274117 #12 Jun 11 2016 00:54:39
%S A274117 1,12,1064,252160,115315200,86449126400,96313245952000,
%T A274117 149342026677043200,307513455044956160000,811744577542368870400000,
%U A274117 2672529840751688498380800000,10735527449319396895332761600000,51677469466519591978527317032960000,293652804750537765304678163152896000000
%N A274117 a(n) = ((6n-5)!!!+(6n-4)!!!)/(6n-3).
%C A274117 Sequence is similar to A273889, with a similar proof of divisibility.
%H A274117 Brian Cheung, <a href="/A274117/b274117.txt">Table of n, a(n) for n = 1..100</a>
%F A274117 a(n) = ((6n-5)!!!+(6n-4)!!!)/(6n-3).
%e A274117 a(1) = (1+2)/3 = 1;
%e A274117 a(2) = (1*4*7+2*5*8)/9 = 12;
%e A274117 a(3) = (1*4*7*10*13+2*5*8*11*14)/15 = 1064.
%t A274117 B[n_, k_] := (Product[k (i - 1) + 1, {i, 2 n - 1}] + Product[k (i - 1) + 2, {i, 2 n - 1}])/(2 k (n - 1) + 3); Table[B[n, 3], {n, 14}] (* _Michael De Vlieger_, Jun 10 2016 *)
%o A274117 (Python)
%o A274117 triplefac=lambda x:1 if x<2 else x*triplefac(x-3)
%o A274117 for i in range(1,101):
%o A274117 print(i,(triplefac(6*i-5)+triplefac(6*i-4))//(6*i-3))
%Y A274117 Cf. A007661, A273889.
%K A274117 nonn
%O A274117 1,2
%A A274117 _Hong-Chang Wang_, _Brian Cheung_, Jun 10 2016