cp's OEIS Frontend

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.

A180338 Triangle by rows, A033452 convolved with A000079.

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%I A180338 #4 Jun 02 2025 03:03:43
%S A180338 1,2,5,4,10,22,8,20,44,99,16,40,88,198,471,32,80,176,396,942,2386,64,
%T A180338 160,352,792,1884,4772,12867,128,324,704,1584,3768,9544,25734,73681
%N A180338 Triangle by rows, A033452 convolved with A000079.
%C A180338 Row sums = A058681: (1, 7, 36, 171, 813, 4012, 20891,...).
%F A180338 Antidiagonals of a multiplication table generated from A033452 * powers of 2.
%e A180338 First few rows of the triangle =
%e A180338 1;
%e A180338 2, 5;
%e A180338 4, 10, 22;
%e A180338 8, 20, 44, 99;
%e A180338 16, 40, 88, 198, 471;
%e A180338 32, 80, 176, 396, 942, 2386;
%e A180338 64, 160, 352, 792, 1884, 4772, 12867;
%e A180338 128, 324, 704, 1584, 3768, 9544, 25734, 73681;
%e A180338 ...
%Y A180338 Cf. A033452, A058681
%K A180338 nonn,tabl
%O A180338 0,2
%A A180338 _Gary W. Adamson_, Aug 28 2010