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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.

A218780 A014486-codes for the compact representation of Beanstalk-tree, growing by two natural numbers at time, starting from the tree of one internal node (1) and two leaves (2 and 3), with the lesser numbers coming to the left hand side.

Table of values

n a(n)
1 2
2 10
3 44
4 180
5 728
6 2928
7 11720
8 46888
9 187568
10 750304
11 3001232
12 12004960
13 48019856
14 192079504
15 768318048
16 3073272224
17 12293088960
18 49172355968
19 196689423936
20 786757695872
21 3147030783552
22 12588123134528
23 50352492538240
24 201409970153216
25 805639880612992

List of values

[2, 10, 44, 180, 728, 2928, 11720, 46888, 187568, 750304, 3001232, 12004960, 48019856, 192079504, 768318048, 3073272224, 12293088960, 49172355968, 196689423936, 786757695872, 3147030783552, 12588123134528, 50352492538240, 201409970153216, 805639880612992]

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

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