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.

A183315 Number of n X 3 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it.

Table of values

n a(n)
1 5
2 13
3 43
4 124
5 377
6 1109
7 3305
8 9767
9 28959
10 85677
11 253693
12 750777
13 2222308
14 6577131
15 19466625
16 57614249
17 170519517
18 504678557
19 1493676557
20 4420766649
21 13083945331
22 38723960052
23 114609540289
24 339204648201
25 1003928499625

List of values

[5, 13, 43, 124, 377, 1109, 3305, 9767, 28959, 85677, 253693, 750777, 2222308, 6577131, 19466625, 57614249, 170519517, 504678557, 1493676557, 4420766649, 13083945331, 38723960052, 114609540289, 339204648201, 1003928499625]

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

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