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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.

A080014 Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=2, I={1}.

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 6
5 10
6 18
7 35
8 65
9 119
10 221
11 412
12 764
13 1416
14 2629
15 4881
16 9057
17 16807
18 31194
19 57894
20 107442
21 199399
22 370065
23 686799
24 1274617
25 2365544
26 4390184
27 8147680
28 15121161
29 28063153
30 52082017
31 96658283
32 179386750
33 332921362
34 617864098

List of values

[1, 1, 1, 3, 6, 10, 18, 35, 65, 119, 221, 412, 764, 1416, 2629, 4881, 9057, 16807, 31194, 57894, 107442, 199399, 370065, 686799, 1274617, 2365544, 4390184, 8147680, 15121161, 28063153, 52082017, 96658283, 179386750, 332921362, 617864098]

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

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