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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.

A253276 Number of undirected labeled graphs on 2n nodes with exactly n cycle graphs as connected components.

Table of values

n a(n)
0 1
1 1
2 7
3 120
4 3157
5 109935
6 4754200
7 245722477
8 14779601837
9 1014260971581
10 78214593177825
11 6696084566881710
12 630196627700087272
13 64671387743952373150
14 7186999700934499032405
15 859879811676654352591875
16 110201017079975901129209565
17 15061748014412378814910531365

List of values

[1, 1, 7, 120, 3157, 109935, 4754200, 245722477, 14779601837, 1014260971581, 78214593177825, 6696084566881710, 630196627700087272, 64671387743952373150, 7186999700934499032405, 859879811676654352591875, 110201017079975901129209565, 15061748014412378814910531365]

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

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