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.

A288950 Number of relaxed compacted binary trees of right height at most one with empty initial and final sequence on level 0.

Table of values

n a(n)
0 1
1 0
2 1
3 2
4 15
5 140
6 1575
7 20790
8 315315
9 5405400
10 103378275
11 2182430250
12 50414138775
13 1264936572900
14 34258698849375
15 996137551158750
16 30951416768146875
17 1023460181133390000
18 35885072600989486875
19 1329858572860198631250
20 51938365373373313209375

List of values

[1, 0, 1, 2, 15, 140, 1575, 20790, 315315, 5405400, 103378275, 2182430250, 50414138775, 1264936572900, 34258698849375, 996137551158750, 30951416768146875, 1023460181133390000, 35885072600989486875, 1329858572860198631250, 51938365373373313209375]

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

Content is available under The OEIS End-User License Agreement.