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 A073055 #18 Sep 27 2014 14:27:10 %S A073055 1,3,3,12,12,60,540,1080,6480,32400,97200,486000,3888000,34992000, %T A073055 244944000,2204496000,6613488000,13226976000,39680928000,317447424000, %U A073055 1269789696000,7618738176000,15237476352000,91424858112000,365699432448000,1097098297344000 %N A073055 a(n) = product of first n digits in the decimal expansion of Pi, ignoring decimal point. %C A073055 The 33rd digit of Pi is 0, so a(33), a(34), .... = 0. - Philip Bergonio (percyweasley99(AT)yahoo.com), Feb 24 2003 %H A073055 Alois P. Heinz, <a href="/A073055/b073055.txt">Table of n, a(n) for n = 0..100</a> %e A073055 Pi = 3.141592653589793... so a(0) = 1, a(1) = 3, a(2) = 3*1=3, a(3) = 3*1*4=12, a(4) = 3*1*4*1 = 12 and so on. %t A073055 FoldList[Times, 1, First[RealDigits[N[Pi, 50]]]] (Cunningham) %Y A073055 Cf. A000796. %K A073055 easy,nonn,base %O A073055 0,2 %A A073055 Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002 %E A073055 Corrected and extended by Gabriel Cunningham (gcasey(AT)mit.edu), Oct 25 2004