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.

A303619 Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 12
3 38
4 148
5 616
6 2520
7 10288
8 42100
9 172268
10 704776
11 2883500
12 11797636
13 48268920
14 197487780
15 808003420
16 3305872824
17 13525678764
18 55339088836
19 226414867352
20 926355911364
21 3790101263196
22 15506855855704
23 63444895485516

List of values

[1, 12, 38, 148, 616, 2520, 10288, 42100, 172268, 704776, 2883500, 11797636, 48268920, 197487780, 808003420, 3305872824, 13525678764, 55339088836, 226414867352, 926355911364, 3790101263196, 15506855855704, 63444895485516]

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

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