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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.

A307698 Number of evolutionary duplication-loss-histories with n leaves of the caterpillar species tree with 4 leaves.

Table of values

n a(n)
1 4
2 39
3 495
4 7235
5 115303
6 1948791
7 34379505
8 626684162
9 11722058693
10 223870302588
11 4349161774626
12 85701267415112
13 1709101664822416
14 34432888701965454
15 699810795294490974
16 14331183304458656628
17 295434131968070459359
18 6125911207605272841753
19 127680054133385458855845

List of values

[4, 39, 495, 7235, 115303, 1948791, 34379505, 626684162, 11722058693, 223870302588, 4349161774626, 85701267415112, 1709101664822416, 34432888701965454, 699810795294490974, 14331183304458656628, 295434131968070459359, 6125911207605272841753, 127680054133385458855845]

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

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