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 A320101 #19 Oct 28 2021 07:10:09 %S A320101 1,1,2,1,5,43,1,15,463,16372,1,50,5193,583199,65485654,1,175,58653, %T A320101 20788249,7354266811,2602065897364,1,625,663203,741026781,825905301851 %N A320101 Table read by rows: T(n,k) is the number of no-leaf subgraphs of the n X k grid where 1 <= k <= n. %e A320101 Three of the T(4,3) = 463 subgraphs of the 4 X 3 grid with no leaf vertices are %e A320101 + +---+ + + + + +---+ %e A320101 | | | | %e A320101 +---+---+ +---+---+ + +---+ %e A320101 | | , | | |, and . %e A320101 +---+ + + +---+ +---+ + %e A320101 | | | | | | %e A320101 +---+ + +---+ + +---+ + %e A320101 Table begins: %e A320101 n\k| 1 2 3 4 5 6 %e A320101 ---+--------------------------------------------------- %e A320101 1 | 1 %e A320101 2 | 1 2 %e A320101 3 | 1 5 43 %e A320101 4 | 1 15 463 16372 %e A320101 5 | 1 50 5193 583199 65485654 %e A320101 6 | 1 175 58653 20788249 7354266811 2602065897364 %Y A320101 Cf. A093129, A301976, A320097, A320099. %K A320101 nonn,tabl,more %O A320101 1,3 %A A320101 _Peter Kagey_, Oct 05 2018