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.

A198656 Number of nX2 0..7 arrays with values 0..7 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.

Table of values

n a(n)
1 1
2 3
3 14
4 76
5 488
6 3521
7 28030
8 242883
9 2267306
10 22621072
11 239604079
12 2677734762
13 31381450817
14 383270472363
15 4847901589642
16 63125725801101
17 841517900517550
18 11429291342102135
19 157506922063918536
20 2195111769933116471

List of values

[1, 3, 14, 76, 488, 3521, 28030, 242883, 2267306, 22621072, 239604079, 2677734762, 31381450817, 383270472363, 4847901589642, 63125725801101, 841517900517550, 11429291342102135, 157506922063918536, 2195111769933116471]

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

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