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.

A274891 Number of nX4 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-1) or (-2,0) and new values introduced in order 0..2.

Table of values

n a(n)
1 4
2 36
3 37
4 104
5 275
6 753
7 2049
8 5602
9 15305
10 41866
11 114475
12 313122
13 856462
14 2342559
15 6407780
16 17526908
17 47941766
18 131135884
19 358697083
20 981151642
21 2683758871
22 7340930445
23 20079778989
24 54924550811
25 150236085835
26 410943350656

List of values

[4, 36, 37, 104, 275, 753, 2049, 5602, 15305, 41866, 114475, 313122, 856462, 2342559, 6407780, 17526908, 47941766, 131135884, 358697083, 981151642, 2683758871, 7340930445, 20079778989, 54924550811, 150236085835, 410943350656]

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

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