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.

A252068 Number of (n+2)X(1+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 or 4.

Table of values

n a(n)
1 92
2 105
3 183
4 375
5 767
6 1573
7 3279
8 6994
9 15046
10 32452
11 70313
12 153169
13 334742
14 732720
15 1606016
16 3524854
17 7743783
18 17022376
19 37434303
20 82351952
21 181216059
22 398841171
23 877929646
24 1932693875
25 4255002737
26 9368295558
27 20627108406

List of values

[92, 105, 183, 375, 767, 1573, 3279, 6994, 15046, 32452, 70313, 153169, 334742, 732720, 1606016, 3524854, 7743783, 17022376, 37434303, 82351952, 181216059, 398841171, 877929646, 1932693875, 4255002737, 9368295558, 20627108406]

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

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