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 A167248 #8 Jul 22 2025 07:26:55 %S A167248 1,5,23,117,501,2369,9525,39731,145415,554487,1975561,7301317,25334269 %N A167248 Number of ways to partition an n X 4 grid into 4 connected equal-area regions. %F A167248 a(n)= A167260(n,4). - _R. J. Mathar_, Oct 13 2024 %e A167248 All solutions for n=3 %e A167248 ...1.1.2.3...1.1.2.2...1.1.2.2...1.1.2.3...1.1.2.2...1.1.2.2...1.1.1.2 %e A167248 ...1.2.2.3...1.3.2.4...1.3.4.2...1.4.2.3...3.1.2.4...3.1.4.2...3.3.2.2 %e A167248 ...4.4.4.3...3.3.4.4...3.3.4.4...4.4.2.3...3.3.4.4...3.3.4.4...3.4.4.4 %e A167248 ------ %e A167248 ...1.1.1.2...1.1.1.2...1.1.1.2...1.1.2.3...1.2.2.2...1.2.2.3...1.2.2.3 %e A167248 ...3.3.4.2...3.3.3.2...3.4.4.2...4.1.2.3...1.1.3.3...1.1.2.3...1.2.3.3 %e A167248 ...3.4.4.2...4.4.4.2...3.3.4.2...4.4.2.3...4.4.4.3...4.4.4.3...1.4.4.4 %e A167248 ------ %e A167248 ...1.2.2.3...1.2.3.3...1.2.3.3...1.2.3.3...1.2.3.4...1.2.2.2...1.2.2.2 %e A167248 ...1.2.4.3...1.2.2.3...1.2.3.4...1.2.4.3...1.2.3.4...1.3.3.4...1.3.3.3 %e A167248 ...1.4.4.3...1.4.4.4...1.2.4.4...1.2.4.4...1.2.3.4...1.3.4.4...1.4.4.4 %e A167248 ------ %e A167248 ...1.2.2.2...1.2.2.3 %e A167248 ...1.3.4.4...1.4.2.3 %e A167248 ...1.3.3.4...1.4.4.3 %K A167248 nonn %O A167248 1,2 %A A167248 _R. H. Hardin_ Oct 31 2009