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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.

A189771 Number of simple graphs on n nodes that are Euler (all nodes even) but not Eulerian (single cycle passes through all edges).

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 1
7 2
8 7
9 20
10 76
11 334
12 2498
13 36398
14 1225629
15 89060804
16 12978995815
17 3646305137905
18 1947685504386516
19 1969840087225045340
20 3770491704215436784514
21 13674048211165798257589446
22 94122727377410134768239226418

List of values

[0, 0, 0, 0, 0, 1, 2, 7, 20, 76, 334, 2498, 36398, 1225629, 89060804, 12978995815, 3646305137905, 1947685504386516, 1969840087225045340, 3770491704215436784514, 13674048211165798257589446, 94122727377410134768239226418]

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

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