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.

A263969 Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 with each element having index change (+-,+-) 0,2 1,1 or 1,0.

Table of values

n a(n)
1 20
2 72
3 1441
4 13856
5 189993
6 2215960
7 28027420
8 340646784
9 4224499865
10 51860834624
11 639939698625
12 7875999490880
13 97061605202532
14 1195356109670056
15 14726359450425633
16 181392031870723936
17 2234494271219028681

List of values

[20, 72, 1441, 13856, 189993, 2215960, 28027420, 340646784, 4224499865, 51860834624, 639939698625, 7875999490880, 97061605202532, 1195356109670056, 14726359450425633, 181392031870723936, 2234494271219028681]

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

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