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.

A106362 Number of rooted planar trees in which no branch is identical to its adjacent neighbor.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 4
6 10
7 28
8 77
9 221
10 650
11 1951
12 5920
13 18211
14 56509
15 176919
16 557786
17 1769966
18 5647568
19 18110734
20 58335561
21 188658338
22 612337013
23 1994058293
24 6513153445
25 21332562178
26 70048092196
27 230550762108
28 760462920317

List of values

[1, 1, 1, 2, 4, 10, 28, 77, 221, 650, 1951, 5920, 18211, 56509, 176919, 557786, 1769966, 5647568, 18110734, 58335561, 188658338, 612337013, 1994058293, 6513153445, 21332562178, 70048092196, 230550762108, 760462920317]

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

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