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.

A274745 Number of n X 4 0..2 arrays with no element equal to any value at offset (-1,-2) (0,-1) or (-1,0) and new values introduced in order 0..2.

Table of values

n a(n)
1 4
2 22
3 133
4 813
5 4967
6 30349
7 185435
8 1133025
9 6922887
10 42299477
11 258453699
12 1579175897
13 9648910127
14 58955729261
15 360224933899
16 2201007512401
17 13448358549783
18 82170708943301
19 502070597184787
20 3067697574952457

List of values

[4, 22, 133, 813, 4967, 30349, 185435, 1133025, 6922887, 42299477, 258453699, 1579175897, 9648910127, 58955729261, 360224933899, 2201007512401, 13448358549783, 82170708943301, 502070597184787, 3067697574952457]

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

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