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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.

A307696 Number of evolutionary duplication-loss-histories with n leaves of the caterpillar species tree with 2 leaves.

Table of values

n a(n)
1 2
2 7
3 34
4 200
5 1318
6 9354
7 69864
8 541323
9 4310950
10 35066384
11 290081932
12 2432766082
13 20635672664
14 176727482860
15 1526000459400
16 13270616752680
17 116124930068670
18 1021736927603190
19 9033726534916920
20 80220639767921370
21 715166816624282820
22 6398357633173869600

List of values

[2, 7, 34, 200, 1318, 9354, 69864, 541323, 4310950, 35066384, 290081932, 2432766082, 20635672664, 176727482860, 1526000459400, 13270616752680, 116124930068670, 1021736927603190, 9033726534916920, 80220639767921370, 715166816624282820, 6398357633173869600]

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

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