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.

A275138 Number of n X 4 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,-2) or (0,-1) and new values introduced in order 0..2.

Table of values

n a(n)
1 4
2 48
3 224
4 1088
5 5248
6 25344
7 122368
8 590848
9 2852864
10 13774848
11 66510848
12 321142784
13 1550614528
14 7487029248
15 36150575104
16 174550417408
17 842803970048
18 4069417549824
19 19648886079488
20 94873214517248
21 458088402386944

List of values

[4, 48, 224, 1088, 5248, 25344, 122368, 590848, 2852864, 13774848, 66510848, 321142784, 1550614528, 7487029248, 36150575104, 174550417408, 842803970048, 4069417549824, 19648886079488, 94873214517248, 458088402386944]

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

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