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 A300856 #8 Mar 14 2018 16:07:42 %S A300856 0,1,2,3,4,5,6,37,36,35,34,33,32,7,38,19,20,21,22,31,8,39,18,25,24,23, %T A300856 30,9,40,17,26,27,28,29,10,41,16,15,14,13,12,11,42,43,44,45,46,47,48, %U A300856 289,288,287,286,285,284,259,108,109,110,111,112,113,258,107,126,125 %N A300856 Inverse of the base-7 based twisted permutation A300857 of the nonnegative integers. %e A300856 A300857(37) = 7, therefore a(7) = 37. %o A300856 (PARI) vecsort(A300857,,1) \\ where A300857 is a vector of some N initial terms of that sequence without the leading a(0) = 0 and such that these N values contain exactly all integers from 1 to N, e.g., N = 300. %Y A300856 Cf. A300857 (inverse); A300855 = inverse of Knuth's original base-5 analog A220952. %K A300856 nonn %O A300856 0,3 %A A300856 _M. F. Hasler_, Mar 13 2018