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.

A303237 Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 11
3 18
4 55
5 181
6 494
7 1465
8 4415
9 12934
10 38423
11 114145
12 337914
13 1003161
14 2976083
15 8824906
16 26185191
17 77678573
18 230413110
19 683562697
20 2027805127
21 6015399582
22 17845009895
23 52937661977
24 157040038306
25 465863595657
26 1381994981979

List of values

[1, 11, 18, 55, 181, 494, 1465, 4415, 12934, 38423, 114145, 337914, 1003161, 2976083, 8824906, 26185191, 77678573, 230413110, 683562697, 2027805127, 6015399582, 17845009895, 52937661977, 157040038306, 465863595657, 1381994981979]

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

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