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.

A263593 Number of length n arrays of permutations of 0..n-1 with each element moved by -4 to 4 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 52
6 164
7 476
8 1428
9 4308
10 12816
11 38324
12 114924
13 343696
14 1028096
15 3077672
16 9209704
17 27556452
18 82465380
19 246779888
20 738461796
21 2209820148
22 6612853424
23 19788642456
24 59216642832
25 177203814880
26 530275470412
27 1586827690308

List of values

[1, 2, 6, 16, 52, 164, 476, 1428, 4308, 12816, 38324, 114924, 343696, 1028096, 3077672, 9209704, 27556452, 82465380, 246779888, 738461796, 2209820148, 6612853424, 19788642456, 59216642832, 177203814880, 530275470412, 1586827690308]

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

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