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.

A274723 Number of n X 3 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) or (-1,0) and new values introduced in order 0..2.

Table of values

n a(n)
1 5
2 24
3 68
4 260
5 1040
6 4132
7 16524
8 66088
9 264332
10 1057316
11 4229264
12 16917028
13 67668108
14 270672424
15 1082689676
16 4330758692
17 17323034768
18 69292139044
19 277168556172
20 1108674224680
21 4434696898700
22 17738787594788
23 70955150379152

List of values

[5, 24, 68, 260, 1040, 4132, 16524, 66088, 264332, 1057316, 4229264, 16917028, 67668108, 270672424, 1082689676, 4330758692, 17323034768, 69292139044, 277168556172, 1108674224680, 4434696898700, 17738787594788, 70955150379152]

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

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