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 A068201 #7 Feb 02 2024 18:29:46 %S A068201 1,2,6,24,120,720,4920,37320,309120,2763720,26440920,268864320, %T A068201 2889978120,32689371720,387638491920,4803456571320,62026296732120, %U A068201 832595493624720,11592967532632920,167119530011233320,2489936579950221120,38283169922493447720 %N A068201 One of a family of sequences that interpolates between the Bell numbers and the factorials. %D A068201 G. Labelle et al., Stirling numbers interpolation using permutations with forbidden subsequences, Discrete Math. 246 (2002), 177-195. %p A068201 g:= proc(n) option remember; `if` (n=0, 1, (1+add(binomial (n-1, k-1) * g(n-k), k=1..n-1)) * 5) end: %p A068201 a:= n-> `if`(n<=2, (n+1)!, 24*g(n-3)): seq (a(n), n=0..25); # _Sean A. Irvine_, Feb 02 2024 %Y A068201 Cf. A000110, A001861, A068199, A068200, this, ..., A000142. %K A068201 nonn %O A068201 0,2 %A A068201 _N. J. A. Sloane_, Mar 23 2002 %E A068201 More terms from _Sean A. Irvine_, Feb 02 2024