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 A181242 #5 Jul 22 2025 08:38:36 %S A181242 128,8042,546410,36806846,2481942354,167341334542,11282914491066, %T A181242 760744103230314,51292751478532550,3458385370907981754, %U A181242 233179719922207016438,15722013576638868003178,1060048065098345660585310 %N A181242 Number of nX7 binary matrices with no 2X2 circuit having pattern 0101 in any orientation. %C A181242 Column 7 of A181245 %H A181242 R. H. Hardin, <a href="/A181242/b181242.txt">Table of n, a(n) for n=1..200</a> %F A181242 Empirical: a(n)=77*a(n-1)-429*a(n-2)-16791*a(n-3)+132938*a(n-4)+1140609*a(n-5)-11250708*a(n-6)-21101443*a(n-7)+356560316*a(n-8)-276630106*a(n-9)-3595865197*a(n-10)+5253257444*a(n-11)+16399879057*a(n-12)-30419637636*a(n-13)-37486637674*a(n-14)+87632998667*a(n-15)+40083109062*a(n-16)-140235056122*a(n-17)-7589163210*a(n-18)+128111780723*a(n-19)-23221600421*a(n-20)-65939015129*a(n-21)+21868944788*a(n-22)+18307048178*a(n-23)-8259596531*a(n-24)-2431120428*a(n-25)+1497147381*a(n-26)+85285300*a(n-27)-123174410*a(n-28)+8581030*a(n-29)+3300116*a(n-30)-512304*a(n-31)+18304*a(n-32) %K A181242 nonn %O A181242 1,1 %A A181242 _R. H. Hardin_ Oct 10 2010