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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.

A121446 Number of ternary trees with n edges and such that the first leaf in the preorder traversal is at level 1.

Table of values

n a(n)
1 3
2 3
3 10
4 42
5 198
6 1001
7 5304
8 29070
9 163438
10 937365
11 5462730
12 32256120
13 192565800
14 1160346492
15 7048030544
16 43108428198
17 265276342782
18 1641229898525
19 10202773534590
20 63698396932170
21 399223286267190
22 2510857763851185
23 15842014607109600
24 100244747986099080

List of values

[3, 3, 10, 42, 198, 1001, 5304, 29070, 163438, 937365, 5462730, 32256120, 192565800, 1160346492, 7048030544, 43108428198, 265276342782, 1641229898525, 10202773534590, 63698396932170, 399223286267190, 2510857763851185, 15842014607109600, 100244747986099080]

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

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