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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.

A090375 Number of unrooted Eulerian maps with bicolored faces which are self-isomorphic under reversing the colors.

Table of values

n a(n)
1 1
2 1
3 2
4 4
5 8
6 17
7 40
8 93
9 224
10 538
11 1344
12 3352
13 8448
14 21573
15 54912
16 143037
17 366080
18 968083
19 2489344
20 6664856
21 17199104
22 46515759
23 120393728
24 328382874
25 852017152
26 2340706462
27 6085836800
28 16822999572
29 43818024960
30 121777594508
31 317680680960
32 887053276477

List of values

[1, 1, 2, 4, 8, 17, 40, 93, 224, 538, 1344, 3352, 8448, 21573, 54912, 143037, 366080, 968083, 2489344, 6664856, 17199104, 46515759, 120393728, 328382874, 852017152, 2340706462, 6085836800, 16822999572, 43818024960, 121777594508, 317680680960, 887053276477]

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

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