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 A322768 #16 Aug 06 2021 15:00:16 %S A322768 66,249,1075,5133,26683,149410,894124,5683643,38186471,270054693, %T A322768 2003233849,15539557832,125727364954,1058517565329,9254401000167, %U A322768 83864649249661,786443164853871,7620060523287298,76182494678422156,784894262599538443,8323844770001318027,90767456208155581709 %N A322768 Column 3 of array in A322765. %D A322768 D. E. Knuth, The Art of Computer Programming, Vol. 4A, Table A-1, page 778. %H A322768 Seiichi Manyama, <a href="/A322768/b322768.txt">Table of n, a(n) for n = 0..500</a> %o A322768 (PARI) T(n, k) = if(k==0, sum(j=0, n, stirling(n, j, 2)), (T(n+2, k-1)+T(n+1, k-1)+sum(j=0, k-1, binomial(k-1, j)*T(n, j)))/2); %o A322768 vector(20, n, T(n-1, 3)) \\ _Seiichi Manyama_, Nov 21 2020 %Y A322768 Cf. A322765, A322774. %K A322768 nonn %O A322768 0,1 %A A322768 _N. J. A. Sloane_, Dec 30 2018