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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.

A316666 Number of simple relaxed compacted binary trees of right height at most one with no sequences on level 1 and no final sequences on level 0.

Table of values

n a(n)
0 1
1 0
2 1
3 3
4 15
5 87
6 597
7 4701
8 41787
9 413691
10 4512993
11 53779833
12 695000919
13 9680369943
14 144560191149
15 2303928046437
16 39031251610227
17 700394126116851
18 13270625547477177
19 264748979672169681
20 5547121478845459983
21 121784530649198053263
22 2795749225338111831429
23 66981491857058929294653

List of values

[1, 0, 1, 3, 15, 87, 597, 4701, 41787, 413691, 4512993, 53779833, 695000919, 9680369943, 144560191149, 2303928046437, 39031251610227, 700394126116851, 13270625547477177, 264748979672169681, 5547121478845459983, 121784530649198053263, 2795749225338111831429, 66981491857058929294653]

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

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