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.

A263782 Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and exactly two more elements moved upwards than downwards.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 10
7 31
8 134
9 439
10 1604
11 5088
12 17115
13 54199
14 176073
15 552856
16 1755516
17 5472509
18 17149688
19 53191180
20 165306987
21 510614655
22 1578127066
23 4859554763
24 14963066678
25 45966984378
26 141165413462
27 432876102395
28 1326862831744

List of values

[0, 0, 0, 1, 2, 10, 31, 134, 439, 1604, 5088, 17115, 54199, 176073, 552856, 1755516, 5472509, 17149688, 53191180, 165306987, 510614655, 1578127066, 4859554763, 14963066678, 45966984378, 141165413462, 432876102395, 1326862831744]

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

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