cp's OEIS Frontend

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.

A303422 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 32
3 252
4 1985
5 15647
6 123337
7 972168
8 7662841
9 60400282
10 476088932
11 3752642337
12 29579189147
13 233149966025
14 1837741608616
15 14485501658565
16 114178052735590
17 899977648952776
18 7093830637396745
19 55915203194889879
20 440736480491065049

List of values

[4, 32, 252, 1985, 15647, 123337, 972168, 7662841, 60400282, 476088932, 3752642337, 29579189147, 233149966025, 1837741608616, 14485501658565, 114178052735590, 899977648952776, 7093830637396745, 55915203194889879, 440736480491065049]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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