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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.

A238254 Number of (n+1)X(7+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.

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%I A238254 #5 Jul 23 2025 10:49:28
%S A238254 3249,90225,7616082,640472606,64353451945,5017308028639,
%T A238254 395035485087390,24520763755992781,1504227932142140703,
%U A238254 75758809125961889230
%N A238254 Number of (n+1)X(7+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing columnwise and rowwise.
%C A238254 Column 7 of A238255
%e A238254 Some solutions for n=2
%e A238254 ..1..0..1..0..1..0..0..0....0..0..0..1..1..1..0..0....0..0..0..0..0..0..1..1
%e A238254 ..0..0..0..0..0..1..1..1....1..0..1..0..0..0..1..1....0..0..0..1..1..1..1..1
%e A238254 ..1..0..1..0..1..0..1..0....0..1..0..1..1..1..1..1....1..0..1..0..0..1..1..0
%K A238254 nonn
%O A238254 1,1
%A A238254 _R. H. Hardin_, Feb 21 2014

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