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.

A264881 Number of (4+1)X(n+1) arrays of permutations of 0..n*5+4 with each element having directed index change 0,1 0,-1 -2,0 or 1,1.

Table of values

n a(n)
1 2
2 0
3 20
4 12
5 572
6 2348
7 22152
8 129230
9 915192
10 5625202
11 37271957
12 233347958
13 1512344735
14 9550825980
15 61315204660
16 389091647972
17 2487355416820
18 15822559226124
19 100953094987052
20 642909203731360
21 4098621203473156

List of values

[2, 0, 20, 12, 572, 2348, 22152, 129230, 915192, 5625202, 37271957, 233347958, 1512344735, 9550825980, 61315204660, 389091647972, 2487355416820, 15822559226124, 100953094987052, 642909203731360, 4098621203473156]

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

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