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 A167247 #15 Jan 21 2025 16:43:04 %S A167247 1,4,19,70,245,856,2967,10164,34463,115904,387379,1288574,4270853, %T A167247 14116936,46567963,153385198 %N A167247 Number of ways to partition an n X 4 grid into 2 connected equal-area regions. %H A167247 Manuel Kauers, Christoph Koutschan, and George Spahn, <a href="https://arxiv.org/abs/2209.01787">A348456(4) = 7157114189</a>, arXiv:2209.01787 [math.CO], 2022. %H A167247 Manuel Kauers, Christoph Koutschan, and George Spahn, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL25/Kauers/kauers6.html">How Does the Gerrymander Sequence Continue?</a>, J. Int. Seq., Vol. 25 (2022), Article 22.9.7. %e A167247 All solutions for n=3 %e A167247 ...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1 %e A167247 ...1.1.2.2...1.2.1.2...1.2.2.1...1.2.2.2...2.1.1.2...2.1.2.1...2.2.1.1 %e A167247 ...2.2.2.2...2.2.2.2...2.2.2.2...1.2.2.2...2.2.2.2...2.2.2.2...2.2.2.2 %e A167247 ------ %e A167247 ...1.1.1.1...1.1.1.2...1.1.1.2...1.1.1.2...1.1.1.2...1.1.2.2...1.1.2.2 %e A167247 ...2.2.2.1...1.1.1.2...1.1.2.2...1.2.1.2...1.2.2.2...1.1.1.2...1.1.2.2 %e A167247 ...2.2.2.1...2.2.2.2...1.2.2.2...1.2.2.2...1.1.2.2...1.2.2.2...1.1.2.2 %e A167247 ------ %e A167247 ...1.1.2.2...1.2.2.2...1.2.2.2...1.2.2.2...1.2.2.2 %e A167247 ...1.2.2.2...1.1.1.2...1.1.2.2...1.2.1.2...1.2.2.2 %e A167247 ...1.1.1.2...1.1.2.2...1.1.1.2...1.1.1.2...1.1.1.1 %Y A167247 Cf. A167242, A348456. %K A167247 nonn,more %O A167247 1,2 %A A167247 _R. H. Hardin_, Oct 31 2009