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 A181181 #7 Mar 30 2012 18:40:58 %S A181181 1,22,756,35464,2112320,152681760,12984899200,1270453824640, %T A181181 140587147048320,204867922610391040,222308451584243548160, %U A181181 277934723066170025856000,385262452280397590195584000,954777912911324324000159027200,3057686768847576381964905048883200 %N A181181 Product of the first n zero-free positive numbers with digital sum n. %C A181181 Product of the first n values in the n-th row of the triangular array A069800 in which n-th row consists of numbers (excluding the digit 0) with digit sum n arranged in increasing numerical order. %e A181181 a(3) = 756 = 3 * 12 * 21. %e A181181 a(4) = 35464 = 4 * 13 * 22 * 31. %e A181181 a(5) = 2112320 = 5 * 14 * 23 * 32 * 41. %Y A181181 Cf. A007953, A069800, A181178. %K A181181 nonn,base,easy %O A181181 1,2 %A A181181 _Jonathan Vos Post_, Jan 25 2011