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.

A263740 Number of length n arrays of permutations of 0..n-1 with each element moved by -4 to 4 places and equal numbers of elements moved upwards and downwards.

Table of values

n a(n)
1 1
2 2
3 4
4 14
5 46
6 214
7 664
8 2516
9 7989
10 30299
11 104622
12 399316
13 1411880
14 5298114
15 18971986
16 70774024
17 256952680
18 957861715
19 3507882839
20 13059944402
21 48088198908
22 178984147550
23 661805950128
24 2464463156096
25 9141021963396

List of values

[1, 2, 4, 14, 46, 214, 664, 2516, 7989, 30299, 104622, 399316, 1411880, 5298114, 18971986, 70774024, 256952680, 957861715, 3507882839, 13059944402, 48088198908, 178984147550, 661805950128, 2464463156096, 9141021963396]

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

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