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 A033645 #5 Mar 30 2012 18:35:33 %S A033645 1,1,2,6,24,120,720,5040,720,5760,12240,42480,182160,953280,5901840, %T A033645 42266160,11803680,96336000,216279360,841510080,3798599040, %U A033645 20676015360,131653290240,962925062400,394959870720,3283735057920,7752349728000 %N A033645 Base 8 digital convolution sequence. %e A033645 Suppose base = 3 and a(0)..a(13) are 1 1 2 1 3 7 6 20 52 6 26 104 32 162. In base 3, 14 = 112, so we convolve the last three terms with 1, 1, 2 to obtain 104*1+32*1+162*2 = 460. %K A033645 base,nonn %O A033645 0,3 %A A033645 _David W. Wilson_