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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.

A273256 Number of simple labeled graphs on n vertices with at most one nontrivial component and all vertex degrees are even.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 8
5 64
6 1014
7 32593
8 2093589
9 268333725
10 68714765337
11 35183979518038
12 36028733659454920
13 73786955927716463496
14 302231441864128208088266
15 2475880062024448199702310129
16 40564819165779582804001294004849
17 1329227995578862816338009185350962977
18 87112285929737129482236375622145146977689

List of values

[1, 1, 1, 2, 8, 64, 1014, 32593, 2093589, 268333725, 68714765337, 35183979518038, 36028733659454920, 73786955927716463496, 302231441864128208088266, 2475880062024448199702310129, 40564819165779582804001294004849, 1329227995578862816338009185350962977, 87112285929737129482236375622145146977689]

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

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