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 A171609 #21 Dec 28 2022 09:13:33
%S A171609 1,2,4,6,12,16,24,30,60,72,96,112,168,192,240,270,540,600,720,792,
%T A171609 1056,1152,1344,1456,2184,2352,2688,2880,3600,3840,4320,4590,9180,
%U A171609 9720,10800,11400,13680,14400,15840,16632,22176,23232,25344,26496,30912,32256,34944,36400,54600,56784
%N A171609 a(2*n) = (n+1)*a(n), a(2*n+1) = (n+1)*a(n+1), with a(1) = 1.
%C A171609 The left column of the matrix powers A171608^n in the limit n->oo. (The other columns all become 0.)
%F A171609 Limit_{n->oo} (A171608)^n, a left-shifted vector considered as a sequence.
%F A171609 a(n+1) = a(n) * (1 + 1/A003602(n)). - _Michael Somos_, Dec 27 2022
%e A171609 The cube of A171608 starts
%e A171609 1 0 0 0 0 0 0 0 0 0
%e A171609 2 0 0 0 0 0 0 0 0 0
%e A171609 4 0 0 0 0 0 0 0 0 0
%e A171609 6 0 0 0 0 0 0 0 0 0
%e A171609 12 0 0 0 0 0 0 0 0 0
%e A171609 16 0 0 0 0 0 0 0 0 0
%e A171609 24 0 0 0 0 0 0 0 0 0
%e A171609 30 0 0 0 0 0 0 0 0 0
%e A171609 0 30 0 0 0 0 0 0 0 0
%e A171609 0 36 0 0 0 0 0 0 0 0
%e A171609 ... and the first 8 entries of the left column are already "converged." - _R. J. Mathar_, Sep 23 2021
%o A171609 (PARI) {a(n) = if(n < 2, n==0, (n\2 + 1)*a((n+1)\2))}; /* _Michael Somos_, Dec 27 2022 */
%Y A171609 Cf. A003602, A171608
%K A171609 nonn
%O A171609 1,2
%A A171609 _Gary W. Adamson_, Dec 12 2009
%E A171609 More terms from _R. J. Mathar_, Sep 23 2021
%E A171609 Name changed by _Michael Somos_, Dec 27 2022