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.

A228386 Number of n X 4 binary arrays with top left value 1 and no two ones adjacent horizontally or vertically.

Table of values

n a(n)
1 3
2 12
3 72
4 382
5 2104
6 11449
7 62546
8 341249
9 1862631
10 10165343
11 55480071
12 302792766
13 1652555713
14 9019158650
15 49223917246
16 268649627276
17 1466210540982
18 8002145144295
19 43673350799304
20 238356282199103
21 1300878367732021

List of values

[3, 12, 72, 382, 2104, 11449, 62546, 341249, 1862631, 10165343, 55480071, 302792766, 1652555713, 9019158650, 49223917246, 268649627276, 1466210540982, 8002145144295, 43673350799304, 238356282199103, 1300878367732021]

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

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