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.

A276294 Number of n X 3 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,1) or (0,-1) and new values introduced in order 0..2.

Table of values

n a(n)
1 2
2 12
3 45
4 189
5 805
6 3437
7 14693
8 62829
9 268677
10 1148973
11 4913509
12 21012333
13 89858053
14 384272941
15 1643321829
16 7027574381
17 30053031045
18 128520116269
19 549609131621
20 2350372894061
21 10051239005445
22 42983564779053

List of values

[2, 12, 45, 189, 805, 3437, 14693, 62829, 268677, 1148973, 4913509, 21012333, 89858053, 384272941, 1643321829, 7027574381, 30053031045, 128520116269, 549609131621, 2350372894061, 10051239005445, 42983564779053]

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

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