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.

A263592 Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and the median of every three consecutive elements nondecreasing.

Table of values

n a(n)
1 1
2 2
3 6
4 16
5 41
6 108
7 280
8 729
9 1908
10 4969
11 12950
12 33796
13 88112
14 229740
15 599191
16 1562470
17 4074372
18 10625188
19 27707446
20 72253034
21 188417568
22 491341657
23 1281284446
24 3341248089
25 8713071846
26 22721332009
27 59251115518
28 154510913809

List of values

[1, 2, 6, 16, 41, 108, 280, 729, 1908, 4969, 12950, 33796, 88112, 229740, 599191, 1562470, 4074372, 10625188, 27707446, 72253034, 188417568, 491341657, 1281284446, 3341248089, 8713071846, 22721332009, 59251115518, 154510913809]

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

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