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 A347800 #7 Sep 14 2021 06:57:37 %S A347800 1,0,1,1,2,1,7,1,48,50,796,777,24823,9315,1501873,2585314,200614419, %T A347800 382810931,52597087873,48712723680,27115688491527 %N A347800 Number of tilings of an n X n square using integer-sided square tiles of area > 1. %F A347800 a(n) = A226206(n,n). %e A347800 a(4) = 2: %e A347800 ._._._._. ._._._._. %e A347800 | | | | | %e A347800 | | |___|___| %e A347800 | | | | | %e A347800 |_______| |___|___| . %Y A347800 Main diagonal of A226206. %Y A347800 Cf. A045846. %K A347800 nonn,more %O A347800 0,5 %A A347800 _Alois P. Heinz_, Sep 14 2021