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.

A222650 Number of nX1 0..3 arrays with no more than floor(nX1/2) elements equal to at least one king-move neighbor, with new values introduced in row major 0..3 order.

Table of values

n a(n)
1 1
2 1
3 2
4 11
5 34
6 131
7 438
8 2150
9 7676
10 32491
11 116096
12 533186
13 1945184
14 8362152
15 30561808
16 135650378
17 501075616
18 2155759835
19 7986345032
20 34780282521
21 129686419290
22 555913562689
23 2079094345694
24 8947148045345
25 33609869742022

List of values

[1, 1, 2, 11, 34, 131, 438, 2150, 7676, 32491, 116096, 533186, 1945184, 8362152, 30561808, 135650378, 501075616, 2155759835, 7986345032, 34780282521, 129686419290, 555913562689, 2079094345694, 8947148045345, 33609869742022]

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

Content is available under The OEIS End-User License Agreement.