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.

A302070 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 32
3 148
4 748
5 3657
6 18108
7 89658
8 444359
9 2202106
10 10912859
11 54080195
12 268002332
13 1328125172
14 6581720890
15 32616691234
16 161636836900
17 801015249307
18 3969549529089
19 19671689743540
20 97485967746453
21 483106130247259

List of values

[4, 32, 148, 748, 3657, 18108, 89658, 444359, 2202106, 10912859, 54080195, 268002332, 1328125172, 6581720890, 32616691234, 161636836900, 801015249307, 3969549529089, 19671689743540, 97485967746453, 483106130247259]

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

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