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 A264435 #19 Mar 27 2020 13:26:29 %S A264435 1,0,1,0,-1,1,0,0,-3,1,0,1,3,-6,1,0,1,5,15,-10,1,0,-2,-9,0,45,-15,1,0, %T A264435 -9,-35,-84,-70,105,-21,1,0,-9,19,-14,-259,-350,210,-28,1,0,50,369, %U A264435 873,966,-189,-1134,378,-36,1,0,267,611,1260,3645,5565,1827,-2940,630,-45,1 %N A264435 Triangle read by rows, Bell transform of the complementary Bell numbers (A000587). %H A264435 Peter Luschny, <a href="https://oeis.org/wiki/User:Peter_Luschny/BellTransform">The Bell transform</a> %e A264435 Triangle starts: %e A264435 [1] %e A264435 [0, 1] %e A264435 [0, -1, 1] %e A264435 [0, 0, -3, 1] %e A264435 [0, 1, 3, -6, 1] %e A264435 [0, 1, 5, 15, -10, 1] %e A264435 [0, -2, -9, 0, 45, -15, 1] %e A264435 [0, -9, -35, -84, -70, 105, -21, 1] %e A264435 [0, -9, 19, -14, -259, -350, 210, -28, 1] %e A264435 [0, 50, 369, 873, 966, -189, -1134, 378, -36, 1] %e A264435 [0, 267, 611, 1260, 3645, 5565, 1827, -2940, 630, -45, 1] %o A264435 (Sage) # uses[bell_transform from A264428] %o A264435 def A264435_triangle(dim): %o A264435 uno = [1]*dim %o A264435 complementary_bell_numbers = [sum((-1)^n*b for (n,b) in enumerate (bell_transform(n,uno))) for n in range(dim)] %o A264435 for n in range(dim): %o A264435 print(bell_transform(n, complementary_bell_numbers)) %o A264435 A264435_triangle(12) %Y A264435 Cf. A000587, A264428. %K A264435 sign,tabl %O A264435 0,9 %A A264435 _Peter Luschny_, Dec 01 2015