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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.

A339152 Number of essentially parallel nonequivalent series-parallel networks with n elements and without unit elements in parallel.

Table of values

n a(n)
1 1
2 0
3 0
4 1
5 1
6 3
7 4
8 9
9 16
10 33
11 63
12 131
13 261
14 545
15 1123
16 2359
17 4948
18 10502
19 22307
20 47731
21 102367
22 220600
23 476626
24 1033450
25 2246252
26 4895935
27 10694744
28 23414838
29 51364180
30 112891831
31 248548836
32 548123924
33 1210612692
34 2677682900
35 5930586249
36 13151963729
37 29201456634

List of values

[1, 0, 0, 1, 1, 3, 4, 9, 16, 33, 63, 131, 261, 545, 1123, 2359, 4948, 10502, 22307, 47731, 102367, 220600, 476626, 1033450, 2246252, 4895935, 10694744, 23414838, 51364180, 112891831, 248548836, 548123924, 1210612692, 2677682900, 5930586249, 13151963729, 29201456634]

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

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