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 A349903 #9 May 25 2022 10:49:45 %S A349903 0,0,1,0,1,0,0,1,1,-1,0,0,1,0,0,0,0,1,1,0,0,0,0,0,1,2,-1,0,0,0,0,1,2, %T A349903 2,0,0,0,0,0,0,1,3,4,0,0,0,0,0,0,1,2,6,5,0,0,0,0,0,0,0,1,4,10,8,0,0,0, %U A349903 0,0,0,0,1,2,7,18,11,0,0,0,0,0,0,0,0,1,4,14,31,18,0,0 %N A349903 Array read by ascending antidiagonals. Inverse Euler transform of the right-shifted k-bonacci numbers. %e A349903 Array starts: %e A349903 [0] 0, 1, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ... %e A349903 [1] 0, 1, 1, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0, ... %e A349903 [2] 0, 1, 1, 1, 2, 2, 4, 5, 8, 11, 18, 25, 40, ... %e A349903 [3] 0, 0, 1, 1, 2, 3, 6, 10, 18, 31, 56, 96, 172, ... %e A349903 [4] 0, 0, 0, 1, 1, 2, 4, 7, 14, 26, 50, 93, 178, ... %e A349903 [5] 0, 0, 0, 0, 1, 1, 2, 4, 8, 15, 30, 58, 114, ... %e A349903 [6] 0, 0, 0, 0, 0, 1, 1, 2, 4, 8, 16, 31, 62, ... %e A349903 [7] 0, 0, 0, 0, 0, 0, 1, 1, 2, 4, 8, 16, 32, ... %e A349903 [8] 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 4, 8, 16, ... %e A349903 [9] 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 4, 8, ... %e A349903 . %e A349903 Compare the rows with the columns of A349802. %p A349903 read transforms; %p A349903 F := proc(n, k) option remember; %p A349903 ifelse(k < 2, k, add(F(n, k-j), j = 1..min(n, k))) end: %p A349903 Frow := (n, len) -> [seq(0, j = 0..n-3), seq(F(n, k), k = 0..len)]: %p A349903 Arow := (n, len) -> EULERi(Frow(n, len)): %p A349903 for n from 0 to 9 do Arow(n, 14 - n) od; %Y A349903 Rows are the inverse Euler transforms of A063524, A057427, A000045, A000073, A000078, A001591, A001592. %Y A349903 Cf. A092921, A349802 %K A349903 sign,tabl %O A349903 0,26 %A A349903 _Peter Luschny_, Dec 05 2021