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.

A263697 Number of length n arrays of permutations of 0..n-1 with each element moved by -2 to 2 places and every three consecutive elements having its maximum within 4 of its minimum.

Table of values

n a(n)
1 1
2 2
3 6
4 14
5 31
6 56
7 104
8 208
9 418
10 873
11 1772
12 3545
13 7103
14 14180
15 28572
16 57620
17 116055
18 233735
19 469754
20 944670
21 1900425
22 3823544
23 7695342
24 15483113
25 31150656
26 62671350
27 126083545
28 253679744
29 510398235
30 1026910104
31 2066113688
32 4156885969

List of values

[1, 2, 6, 14, 31, 56, 104, 208, 418, 873, 1772, 3545, 7103, 14180, 28572, 57620, 116055, 233735, 469754, 944670, 1900425, 3823544, 7695342, 15483113, 31150656, 62671350, 126083545, 253679744, 510398235, 1026910104, 2066113688, 4156885969]

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

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