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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.

A061396 Number of "rooted index-functional forests" (Riffs) on n nodes. Number of "rooted odd trees with only exponent symmetries" (Rotes) on 2n+1 nodes.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 20
5 73
6 281
7 1124
8 4618
9 19387
10 82765
11 358245
12 1568458
13 6933765
14 30907194
15 138760603
16 626898401
17 2847946941
18 13001772692
19 59618918444
20 274463781371
21 1268064807409
22 5877758070220
23 27325789128330
24 127384553264327
25 595318139942874
26 2788598203340643
27 13090395266913748
28 61571972632103632

List of values

[1, 1, 2, 6, 20, 73, 281, 1124, 4618, 19387, 82765, 358245, 1568458, 6933765, 30907194, 138760603, 626898401, 2847946941, 13001772692, 59618918444, 274463781371, 1268064807409, 5877758070220, 27325789128330, 127384553264327, 595318139942874, 2788598203340643, 13090395266913748, 61571972632103632]

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

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