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 A203462 #5 Mar 30 2012 18:36:00 %S A203462 34,35,37,41,47,48,49,51,53,54,55,57,58,59,60,61,62,63,64,65,66,67,68, %T A203462 69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91, %U A203462 92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108 %N A203462 Numbers n such that n!! contains every digit at least once. %e A203462 34 is in the sequence because 34!! = 46620662575398912000 contains every digit at least once. %t A203462 Select[Range[101], Length[Union[IntegerDigits[#!!]]] == 10 &] %Y A203462 Cf. A006882, A178960. %K A203462 nonn,base %O A203462 1,1 %A A203462 _Michel Lagneau_, Jan 02 2012