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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.

A213795 Number of n X n 0..3 symmetric arrays with every row summing to floor(n*3/2).

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%I A213795 #8 Apr 08 2020 01:56:54
%S A213795 1,1,4,29,880,87932,34725760,46259653191,250599609089536,
%T A213795 4664255347861848000,359514810915617810737152,
%U A213795 96221422835240936091862618254,107926925135028470351157750883132800,423270762332675097186733226425581010359872
%N A213795 Number of n X n 0..3 symmetric arrays with every row summing to floor(n*3/2).
%e A213795 Some solutions for n=4
%e A213795 ..0..1..2..3....0..1..2..3....3..1..0..2....2..1..1..2....1..3..0..2
%e A213795 ..1..0..2..3....1..2..1..2....1..1..2..2....1..2..1..2....3..1..1..1
%e A213795 ..2..2..2..0....2..1..2..1....0..2..2..2....1..1..2..2....0..1..2..3
%e A213795 ..3..3..0..0....3..2..1..0....2..2..2..0....2..2..2..0....2..1..3..0
%Y A213795 Column 3 of A213800.
%K A213795 nonn
%O A213795 0,3
%A A213795 _R. H. Hardin_, Jun 20 2012
%E A213795 a(0)=1 prepended and terms a(9) and beyond from _Andrew Howroyd_, Apr 07 2020

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