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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.

A200077 Number of 0..3 arrays x(0..n) of n+1 elements with zero n-1st differences.

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%I A200077 #6 Jul 22 2025 15:40:05
%S A200077 1,4,6,8,14,18,24,56,26,26,54,226,260,482,196,54,128,728,1226,4106,
%T A200077 1168,272,892,4798,1390,1298,962,216,470,2104
%N A200077 Number of 0..3 arrays x(0..n) of n+1 elements with zero n-1st differences.
%C A200077 Column 3 of A200082
%e A200077 Some solutions for n=6
%e A200077 ..3....1....3....1....2....1....0....2....3....2....0....0....2....1....3....2
%e A200077 ..1....2....2....2....3....0....1....1....3....1....0....2....0....3....3....2
%e A200077 ..1....1....1....3....2....1....2....0....3....2....0....2....0....3....1....2
%e A200077 ..2....0....1....3....1....2....2....0....3....3....0....1....1....2....0....2
%e A200077 ..3....0....2....2....1....2....1....1....3....3....0....0....2....1....1....2
%e A200077 ..3....1....3....1....2....1....0....2....3....2....0....0....2....1....3....2
%e A200077 ..1....2....2....2....3....0....1....1....3....1....0....2....0....3....3....2
%K A200077 nonn
%O A200077 1,2
%A A200077 _R. H. Hardin_ Nov 13 2011

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