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 A152736 #4 Feb 08 2022 23:23:38 %S A152736 1,1,1,1,1,2,3,1,2,4,7,3,2,4,10,23,7,6,4,10,26,71,23,14,12,10,26,76, %T A152736 255,71,46,28,30,26,76,232,911,255,142,92,70,78,76,232,764,3535,911, %U A152736 510,284,230,182,228,232,764,2620 %N A152736 Triangle read by rows: M*Q, where M = an infinite lower triangular matrix with A140456 in every column: (1, 1, 1, 3, 7, 23, 71, ...) and Q = a matrix with A000085 as the main diagonal the rest zeros. %C A152736 An eigentriangle. %C A152736 Row sums = A000085 starting with offset 1. %C A152736 Sum of n-th row terms = rightmost term of next row. %e A152736 First few rows of the triangle: %e A152736 1; %e A152736 1, 1; %e A152736 1, 1, 2; %e A152736 3, 1, 2, 4; %e A152736 7, 3, 2, 4, 10; %e A152736 23, 7, 6, 4, 10, 26; %e A152736 71, 23, 14, 12, 10, 26, 76; %e A152736 255, 71, 46, 28, 30, 26, 76, 232; %e A152736 911, 255, 142, 92, 70, 78, 76, 232, 764; %e A152736 3535, 911, 510, 284, 230, 182, 228, 232, 764, 2620; %e A152736 13903, 3535, 1822, 1020, 710, 598, 532, 696, 764, 2620, 9496; %e A152736 ... %e A152736 Row r = (3, 1, 2, 4) = (3*1, 1*1, 1*2, 1*4) = termwise products of (3, 1, 1, 1) and (1, 1, 2, 4), where A000085 = (1, 1, 2, 4, 10, 26, 76, ...). %Y A152736 Cf. A000085, A140456. %K A152736 eigen,nonn,tabl %O A152736 1,6 %A A152736 _Gary W. Adamson_, Dec 12 2008