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.

A268745 Number of n X 3 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

Table of values

n a(n)
1 7
2 32
3 143
4 623
5 2615
6 10830
7 44067
8 177429
9 707163
10 2796840
11 10986379
12 42911627
13 166777091
14 645395334
15 2488065863
16 9559464281
17 36618142447
18 139888931680
19 533099140807
20 2027067051095
21 7692165427919
22 29135580083054
23 110168752548843

List of values

[7, 32, 143, 623, 2615, 10830, 44067, 177429, 707163, 2796840, 10986379, 42911627, 166777091, 645395334, 2488065863, 9559464281, 36618142447, 139888931680, 533099140807, 2027067051095, 7692165427919, 29135580083054, 110168752548843]

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

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