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.

A228279 Number of n X 4 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or nw-se diagonally.

Table of values

n a(n)
1 3
2 6
3 35
4 133
5 587
6 2448
7 10414
8 44024
9 186414
10 789100
11 3340345
12 14140347
13 59858152
14 253389483
15 1072638232
16 4540650778
17 19221306410
18 81366888278
19 344439152622
20 1458066449898
21 6172230293325
22 26128045670722
23 110604228640954

List of values

[3, 6, 35, 133, 587, 2448, 10414, 44024, 186414, 789100, 3340345, 14140347, 59858152, 253389483, 1072638232, 4540650778, 19221306410, 81366888278, 344439152622, 1458066449898, 6172230293325, 26128045670722, 110604228640954]

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

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