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.

A381486 Number of labeled histories for rooted ternary trees with 2n+1 leaves if simultaneous trifurcations are allowed.

Table of values

n a(n)
0 1
1 1
2 10
3 420
4 43960
5 9347800
6 3513910400
7 2131249120000
8 1952028782704000
9 2568150610833808000
10 4666919676058159520000
11 11351087418588355518080000
12 36008099327884173922432000000
13 145785514242304854141480256000000
14 739598808823839440680777500928000000
15 4627885522642342503645368137231360000000

List of values

[1, 1, 10, 420, 43960, 9347800, 3513910400, 2131249120000, 1952028782704000, 2568150610833808000, 4666919676058159520000, 11351087418588355518080000, 36008099327884173922432000000, 145785514242304854141480256000000, 739598808823839440680777500928000000, 4627885522642342503645368137231360000000]

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

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