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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.

A317885 Number of series-reduced free pure achiral multifunctions with one atom and n positions.

Table of values

n a(n)
1 1
2 0
3 0
4 1
5 1
6 1
7 2
8 3
9 4
10 7
11 9
12 14
13 21
14 32
15 45
16 69
17 103
18 153
19 224
20 338
21 500
22 746
23 1107
24 1645
25 2447
26 3652
27 5413
28 8052
29 11993
30 17834
31 26500
32 39447
33 58655
34 87240
35 129772
36 193001
37 287034
38 427014
39 635048
40 944501
41 1404910
42 2089633
43 3107864
44 4622670
45 6875533

List of values

[1, 0, 0, 1, 1, 1, 2, 3, 4, 7, 9, 14, 21, 32, 45, 69, 103, 153, 224, 338, 500, 746, 1107, 1645, 2447, 3652, 5413, 8052, 11993, 17834, 26500, 39447, 58655, 87240, 129772, 193001, 287034, 427014, 635048, 944501, 1404910, 2089633, 3107864, 4622670, 6875533]

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

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