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.

A263679 Number of length n arrays of permutations of 0..n-1 with each element moved by -4 to 4 places and with no two consecutive decreases.

Table of values

n a(n)
1 1
2 2
3 5
4 17
5 70
6 277
7 1009
8 3487
9 11708
10 39905
11 137984
12 481005
13 1680187
14 5852468
15 20335048
16 70581031
17 244962297
18 850636578
19 2955043270
20 10266945188
21 35669911963
22 123914096828
23 430440925456
24 1495206245569
25 5193902810084

List of values

[1, 2, 5, 17, 70, 277, 1009, 3487, 11708, 39905, 137984, 481005, 1680187, 5852468, 20335048, 70581031, 244962297, 850636578, 2955043270, 10266945188, 35669911963, 123914096828, 430440925456, 1495206245569, 5193902810084]

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

Content is available under The OEIS End-User License Agreement.