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 A166773 #9 Dec 12 2024 14:53:54 %S A166773 12,182,3518,67756,1284728,24057962,443968782,8093169792,146041169658, %T A166773 2612337653032,46368803939634,817402784921660,14321271894199646, %U A166773 249540634207399516,4326701163983868212,74685900757658242314,1284014777976657543342,21994406111684553359456 %N A166773 Number of n X 7 1..2 arrays containing at least one of each value, and all equal values connected. %H A166773 Andrew Howroyd, <a href="/A166773/b166773.txt">Table of n, a(n) for n = 1..200</a> %e A166773 Some solutions for n=3 %e A166773 ...2.2.2.2.2.2.1...2.2.2.1.1.1.1...2.2.2.2.2.2.2...2.2.2.2.2.2.2 %e A166773 ...2.2.2.1.1.1.1...2.2.2.1.1.1.1...2.2.2.2.1.2.2...1.1.2.2.1.2.1 %e A166773 ...2.2.1.1.1.1.1...2.2.1.1.1.1.1...2.2.1.1.1.2.2...1.1.1.1.1.1.1 %e A166773 ------ %e A166773 ...2.2.2.2.2.2.2...2.2.2.2.2.2.2...2.2.2.2.2.2.2...2.2.2.2.2.1.1 %e A166773 ...2.2.1.2.1.1.2...2.1.1.2.2.2.2...2.1.1.1.1.2.2...1.2.1.1.1.1.1 %e A166773 ...2.1.1.1.1.1.1...1.1.1.1.1.1.2...1.1.1.1.1.1.2...1.1.1.1.1.1.1 %Y A166773 Twice row 7 of A378932. %K A166773 nonn %O A166773 1,1 %A A166773 _R. H. Hardin_, Oct 21 2009 %E A166773 a(6) onwards from _Andrew Howroyd_, Dec 12 2024