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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.

A263748 Number of length n arrays of permutations of 0..n-1 with each element moved by -4 to 4 places and every three consecutive elements having its maximum within 5 of its minimum.

Table of values

n a(n)
1 1
2 2
3 6
4 24
5 120
6 504
7 930
8 1794
9 3852
10 9246
11 24613
12 69414
13 185540
14 475520
15 1173888
16 2874864
17 7141844
18 18113441
19 46245953
20 118174785
21 300561681
22 759840542
23 1915350786
24 4833118568
25 12216213910
26 30929782130
27 78368738162
28 198501078760

List of values

[1, 2, 6, 24, 120, 504, 930, 1794, 3852, 9246, 24613, 69414, 185540, 475520, 1173888, 2874864, 7141844, 18113441, 46245953, 118174785, 300561681, 759840542, 1915350786, 4833118568, 12216213910, 30929782130, 78368738162, 198501078760]

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

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