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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.

A302165 Number of 3Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 6
3 7
4 12
5 20
6 34
7 56
8 94
9 156
10 262
11 436
12 730
13 1216
14 2034
15 3392
16 5670
17 9460
18 15806
19 26380
20 44066
21 73560
22 122858
23 205112
24 342542
25 571916
26 955062
27 1594660
28 2662890
29 4446320
30 7424674
31 12397424
32 20701558
33 34566948
34 57720430
35 96380668
36 160937266

List of values

[4, 6, 7, 12, 20, 34, 56, 94, 156, 262, 436, 730, 1216, 2034, 3392, 5670, 9460, 15806, 26380, 44066, 73560, 122858, 205112, 342542, 571916, 955062, 1594660, 2662890, 4446320, 7424674, 12397424, 20701558, 34566948, 57720430, 96380668, 160937266]

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

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