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.

A265233 Number of 3 X n arrays containing n copies of 0..2 with no equal vertical neighbors and new values introduced sequentially from 0.

Table of values

n a(n)
0 1
1 1
2 7
3 56
4 495
5 4686
6 46456
7 475392
8 4976271
9 52977890
10 571434402
11 6228357312
12 68468597544
13 758063599632
14 8443936740960
15 94545206802816
16 1063391499647631
17 12007844534804202
18 136068111377744686
19 1546682224461979920
20 17630279034262961010
21 201470426310372260580

List of values

[1, 1, 7, 56, 495, 4686, 46456, 475392, 4976271, 52977890, 571434402, 6228357312, 68468597544, 758063599632, 8443936740960, 94545206802816, 1063391499647631, 12007844534804202, 136068111377744686, 1546682224461979920, 17630279034262961010, 201470426310372260580]

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

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