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.

A263746 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 5 of its minimum.

Table of values

n a(n)
1 1
2 2
3 6
4 14
5 31
6 73
7 160
8 357
9 814
10 1836
11 4140
12 9379
13 21163
14 47769
15 107940
16 243763
17 550469
18 1243468
19 2808345
20 6342601
21 14325494
22 32354798
23 73074320
24 165043749
25 372759852
26 841897006
27 1901473298
28 4294581633
29 9699541870
30 21906956858

List of values

[1, 2, 6, 14, 31, 73, 160, 357, 814, 1836, 4140, 9379, 21163, 47769, 107940, 243763, 550469, 1243468, 2808345, 6342601, 14325494, 32354798, 73074320, 165043749, 372759852, 841897006, 1901473298, 4294581633, 9699541870, 21906956858]

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

Content is available under The OEIS End-User License Agreement.