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 A187883 #6 Jul 22 2025 10:56:07 %S A187883 1,2,1,4,3,1,6,5,3,1,9,8,6,3,1,12,11,9,6,3,1,16,15,13,10,6,3,1,20,19, %T A187883 17,14,10,6,3,1,25,24,22,19,15,10,6,3,1,30,29,27,24,20,15,10,6,3,1,36, %U A187883 35,33,30,26,21,15,10,6,3,1 %N A187883 Triangle by rows, A003983 * A000012 as infinite lower triangular matrices. %C A187883 Sum of n-th row terms = A034828(n+1). %F A187883 Given the correlation triangle A003983, partial sums of terms starting from the right. %e A187883 Row 4 = (6, 5, 3, 1), since row 4 of the A003983 triangle = (1, 2, 2, 1). %e A187883 First few rows of the triangle = %e A187883 1 %e A187883 2, 1 %e A187883 4, 3, 1 %e A187883 6, 5, 3, 1 %e A187883 9, 8, 6, 3, 1 %e A187883 12, 11, 9, 6, 3, 1 %e A187883 16, 15, 13, 10, 6, 3, 1 %e A187883 20, 19, 17, 14, 10, 6, 3, 1 %e A187883 25, 24, 22, 19, 15, 10, 6, 3, 1 %e A187883 30, 29, 27, 24, 20, 15, 10, 6, 3, 1 %e A187883 36, 35, 33, 30, 26, 21, 15, 10, 6, 3, 1 %e A187883 42, 41, 39, 36, 32, 27, 21, 15, 10, 6, 3, 1 %e A187883 ... %Y A187883 Cf. A034828 %K A187883 nonn,tabl %O A187883 1,2 %A A187883 _Gary W. Adamson_, Mar 15 2011