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 A166774 #8 Dec 12 2024 14:53:59 %S A166774 14,240,7432,241542,7855758,253872596,8093169792,255122769986, %T A166774 7970906327712,247157616043778,7612389643759656,233047562889531042, %U A166774 7095832481400967212,214993871402051336458,6485057217704886418618,194824321266936718091888,5831359188043905108147376,173952785425039482256265510 %N A166774 Number of n X 8 1..2 arrays containing at least one of each value, and all equal values connected. %H A166774 Andrew Howroyd, <a href="/A166774/b166774.txt">Table of n, a(n) for n = 1..100</a> %e A166774 Some solutions for n=3 %e A166774 ...2.2.2.2.2.2.2.2...2.1.1.1.1.1.1.1...2.1.1.1.1.1.1.2...2.2.2.2.2.2.2.1 %e A166774 ...1.1.1.2.2.2.2.1...2.1.2.1.1.1.1.1...2.2.1.1.1.1.1.2...2.1.1.1.1.1.1.1 %e A166774 ...1.1.1.1.1.1.1.1...2.2.2.2.2.2.2.2...2.2.2.2.2.2.2.2...2.2.2.2.1.1.1.1 %e A166774 ------ %e A166774 ...1.1.1.1.1.1.1.1...2.2.2.2.1.1.1.1...1.1.1.2.2.2.2.2...2.2.1.1.1.1.1.1 %e A166774 ...1.1.1.1.2.1.1.1...2.2.1.1.1.1.1.1...1.2.2.2.2.2.2.2...2.2.2.2.2.2.1.1 %e A166774 ...1.1.1.1.2.2.2.1...1.1.1.1.1.1.1.1...1.1.1.1.1.1.2.2...2.2.1.1.1.1.1.1 %Y A166774 Twice row 8 of A378932. %K A166774 nonn %O A166774 1,1 %A A166774 _R. H. Hardin_, Oct 21 2009 %E A166774 a(6) onwards from _Andrew Howroyd_, Dec 12 2024