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.

A276243 Number of n X 3 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,1) or (0,-2) and new values introduced in order 0..2.

Table of values

n a(n)
1 3
2 24
3 85
4 347
5 1404
6 5671
7 23000
8 93204
9 377421
10 1529844
11 6199862
12 25119735
13 101801648
14 412550060
15 1671737809
16 6774642628
17 27453734102
18 111251981923
19 450838255264
20 1826978135284
21 7403609436805
22 30002352111444
23 121581392056470

List of values

[3, 24, 85, 347, 1404, 5671, 23000, 93204, 377421, 1529844, 6199862, 25119735, 101801648, 412550060, 1671737809, 6774642628, 27453734102, 111251981923, 450838255264, 1826978135284, 7403609436805, 30002352111444, 121581392056470]

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

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