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 A268040 #24 Mar 14 2019 22:19:31 %S A268040 0,0,1,0,0,2,0,1,2,3,0,0,0,2,4,0,1,0,1,4,5,0,0,2,0,4,4,6,0,1,2,3,4,5, %T A268040 6,7,0,0,0,2,0,4,4,6,8,0,1,0,1,0,1,4,5,8,9,0,0,2,0,0,0,2,4,8,8,10,0,1, %U A268040 2,3,0,1,2,3,8,9,10,11,0,0,0,2,4,0,0,2,8,8,8,10,12 %N A268040 Array y AND NOT x, read by antidiagonals. %C A268040 This is one of eight bitwise truth tables subject to the condition that (0, 0) implies 0. %C A268040 # | A000004 | A004198 | A099026 | A025581 %C A268040 # -------|---------|---------|---------|--------- %C A268040 # (0, 0) | 0 | 0 | 0 | 0 %C A268040 # (0, 1) | 0 | 0 | 0 | 0 %C A268040 # (1, 0) | 0 | 0 | 1 | 1 %C A268040 # (1, 1) | 0 | 1 | 0 | 1 %C A268040 # %C A268040 # | A268040 | A002262 | A003987 | A003986 %C A268040 # -------|---------|---------|---------|--------- %C A268040 # (0, 0) | 0 | 0 | 0 | 0 %C A268040 # (0, 1) | 1 | 1 | 1 | 1 %C A268040 # (1, 0) | 0 | 0 | 1 | 1 %C A268040 # (1, 1) | 0 | 1 | 0 | 1 %C A268040 Transpose of the array in A099026. - _Michel Marcus_, Jan 25 2016 %H A268040 Peter Kagey, <a href="/A268040/b268040.txt">Table of n, a(n) for n = 0..8191</a> %e A268040 The array begins: %e A268040 0, 1, 2, 3, 4, 5, ... %e A268040 0, 0, 2, 2, 4, 4, ... %e A268040 0, 1, 0, 1, 4, 5, ... %e A268040 0, 0, 0, 0, 4, 4, ... %e A268040 0, 1, 2, 3, 0, 1, ... %e A268040 0, 0, 2, 2, 0, 0, ... %e A268040 ... %o A268040 (PARI) T(x, y)=bitnegimply(y, x) \\ _Michel Marcus_, Jan 25 2016 %Y A268040 Cf. A000004, A004198, A099026, A025581, A003987, A002262, A003986. %K A268040 nonn,tabl,look %O A268040 0,6 %A A268040 _Peter Kagey_, Jan 24 2016