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.

A219554 Number of bipartite partitions of (n,n) into distinct pairs.

Table of values

n a(n)
0 1
1 2
2 5
3 17
4 46
5 123
6 323
7 809
8 1966
9 4660
10 10792
11 24447
12 54344
13 118681
14 254991
15 539852
16 1127279
17 2323849
18 4733680
19 9535079
20 19005282
21 37507802
22 73333494
23 142112402
24 273092320
25 520612305
26 984944052
27 1849920722
28 3450476080
29 6393203741
30 11770416313
31 21538246251

List of values

[1, 2, 5, 17, 46, 123, 323, 809, 1966, 4660, 10792, 24447, 54344, 118681, 254991, 539852, 1127279, 2323849, 4733680, 9535079, 19005282, 37507802, 73333494, 142112402, 273092320, 520612305, 984944052, 1849920722, 3450476080, 6393203741, 11770416313, 21538246251]

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

Content is available under The OEIS End-User License Agreement.