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.

A268160 Number of 3Xn arrays containing n copies of 0..3-1 with every element equal to at least one vertical or antidiagonal neighbor and the top left element equal to 0.

Table of values

n a(n)
1 0
2 0
3 8
4 14
5 52
6 1516
7 7582
8 46338
9 501270
10 3535396
11 25480614
12 220369120
13 1716544860
14 13279246254
15 108919001860
16 873463942418
17 6971258302462
18 56716000746978
19 460015101808320
20 3726764125840338
21 30399952923410062

List of values

[0, 0, 8, 14, 52, 1516, 7582, 46338, 501270, 3535396, 25480614, 220369120, 1716544860, 13279246254, 108919001860, 873463942418, 6971258302462, 56716000746978, 460015101808320, 3726764125840338, 30399952923410062]

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

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