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 A214233 #6 Jul 22 2025 23:13:10 %S A214233 4,354,175884,188834753,253155125338,356734116034266, %T A214233 508116551730888266,725424852023224352701,1036196988923824970841964, %U A214233 1480269108515044158376950586,2114704441343238968833690030736 %N A214233 Number of 0..7 colorings of an nX4 array circular in the 4 direction with new values 0..7 introduced in row major order. %C A214233 Column 3 of A214238 %H A214233 R. H. Hardin, <a href="/A214233/b214233.txt">Table of n, a(n) for n = 1..210</a> %F A214233 Empirical: a(n) = 1953*a(n-1) -829512*a(n-2) +119749880*a(n-3) -7217451834*a(n-4) +211005732306*a(n-5) -3163113776744*a(n-6) +24791539817472*a(n-7) -99982144638429*a(n-8) +193376413692421*a(n-9) -161723079970872*a(n-10) +46496477673360*a(n-11) %e A214233 Some solutions for n=4 %e A214233 ..0..1..2..3....0..1..2..1....0..1..0..1....0..1..2..1....0..1..0..1 %e A214233 ..1..2..0..2....1..0..1..2....1..2..1..2....3..0..3..4....1..0..1..2 %e A214233 ..3..4..1..4....0..2..0..3....2..0..2..3....4..2..1..2....0..1..0..3 %e A214233 ..0..1..0..5....4..0..2..1....0..1..0..1....3..1..4..5....1..3..1..0 %K A214233 nonn %O A214233 1,1 %A A214233 _R. H. Hardin_ Jul 08 2012