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.

A275570 Number of 7Xn 0..2 arrays with no element equal to any value at offset (-2,0) (-1,2) or (0,-2) and new values introduced in order 0..2.

Table of values

n a(n)
1 48
2 13824
3 27360
4 54150
5 248520
6 1140576
7 5360184
8 25190406
9 121255722
10 583672614
11 2856462882
12 13979378166
13 68872236498
14 339313015494
15 1674808590654
16 8266655528214
17 40869197474880
18 202051639449600
19 1000919771188800

List of values

[48, 13824, 27360, 54150, 248520, 1140576, 5360184, 25190406, 121255722, 583672614, 2856462882, 13979378166, 68872236498, 339313015494, 1674808590654, 8266655528214, 40869197474880, 202051639449600, 1000919771188800]

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

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