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.

A189585 Number of permutations of 1..n with displacements restricted to {-4,-3,-1,0,2}.

Table of values

n a(n)
1 1
2 1
3 2
4 4
5 10
6 20
7 37
8 72
9 140
10 277
11 553
12 1085
13 2129
14 4185
15 8228
16 16208
17 31902
18 62747
19 123449
20 242860
21 477830
22 940205
23 1849830
24 3639492
25 7160647
26 14088415
27 27719015
28 54537120
29 107301253
30 211114467
31 415365925
32 817229415
33 1607893843
34 3163519669

List of values

[1, 1, 2, 4, 10, 20, 37, 72, 140, 277, 553, 1085, 2129, 4185, 8228, 16208, 31902, 62747, 123449, 242860, 477830, 940205, 1849830, 3639492, 7160647, 14088415, 27719015, 54537120, 107301253, 211114467, 415365925, 817229415, 1607893843, 3163519669]

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

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