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.

A339299 Number of essentially series oriented series-parallel networks with n labeled elements and without multiple unit elements in parallel.

Table of values

n a(n)
1 0
2 2
3 6
4 72
5 840
6 14040
7 276360
8 6494880
9 175452480
10 5375311200
11 183962227680
12 6958070380800
13 288200792880000
14 12974113884251520
15 630742839699772800
16 32933429270386444800
17 1838083950894102912000
18 109201772719684867622400
19 6880730833827011402841600

List of values

[0, 2, 6, 72, 840, 14040, 276360, 6494880, 175452480, 5375311200, 183962227680, 6958070380800, 288200792880000, 12974113884251520, 630742839699772800, 32933429270386444800, 1838083950894102912000, 109201772719684867622400, 6880730833827011402841600]

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

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