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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.

A218777 A014486-indices for the Beanstalk-tree growing one natural number at time, starting from the tree of one internal node (1), with the "lesser numbers to the left hand side" construction.

Table of values

n a(n)
1 1
2 3
3 6
4 15
5 39
6 117
7 359
8 1149
9 3780
10 12752
11 43740
12 152346
13 536655
14 1909411
15 6852153
16 24772328
17 90137210
18 329838392
19 1213048022
20 4481262944
21 16621500330
22 61875433940
23 231099456721
24 865736972546
25 3252139562356
26 12247622197965
27 46232602224402
28 174897265479074

List of values

[1, 3, 6, 15, 39, 117, 359, 1149, 3780, 12752, 43740, 152346, 536655, 1909411, 6852153, 24772328, 90137210, 329838392, 1213048022, 4481262944, 16621500330, 61875433940, 231099456721, 865736972546, 3252139562356, 12247622197965, 46232602224402, 174897265479074]

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

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