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.

A222771 Number of 3Xn 0..1 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

Table of values

n a(n)
1 0
2 4
3 13
4 66
5 158
6 934
7 2446
8 14567
9 39972
10 240130
11 673665
12 4073862
13 11545686
14 70212506
15 200446066
16 1224207384
17 3512430906
18 21526789216
19 62001340484
20 381049009426
21 1100824791540
22 6780941436208
23 19637801359798
24 121196222602133

List of values

[0, 4, 13, 66, 158, 934, 2446, 14567, 39972, 240130, 673665, 4073862, 11545686, 70212506, 200446066, 1224207384, 3512430906, 21526789216, 62001340484, 381049009426, 1100824791540, 6780941436208, 19637801359798, 121196222602133]

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

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