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.

A264516 Number of (n+1) X (4+1) arrays of permutations of 0..n*5+4 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.

Table of values

n a(n)
1 2
2 2
3 42
4 228
5 1644
6 10368
7 65182
8 414414
9 2603670
10 16540506
11 104489208
12 662121980
13 4188014160
14 26506383680
15 167699955140
16 1061128778004
17 6714156638826
18 42483540261942
19 268814679252084
20 1700917160828256
21 10762539724166324

List of values

[2, 2, 42, 228, 1644, 10368, 65182, 414414, 2603670, 16540506, 104489208, 662121980, 4188014160, 26506383680, 167699955140, 1061128778004, 6714156638826, 42483540261942, 268814679252084, 1700917160828256, 10762539724166324]

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

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