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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.

A110320 Number of blocks in all RNA secondary structures with n nodes (an RNA secondary structure can be viewed as a restricted noncrossing partition).

Table of values

n a(n)
1 1
2 2
3 5
4 13
5 32
6 80
7 201
8 505
9 1273
10 3217
11 8146
12 20668
13 52531
14 133726
15 340909
16 870213
17 2223958
18 5689807
19 14571335
20 37350585
21 95821071
22 246015677
23 632088930
24 1625119218
25 4180845277
26 10762096850
27 27718352411
28 71426753423
29 184146711578

List of values

[1, 2, 5, 13, 32, 80, 201, 505, 1273, 3217, 8146, 20668, 52531, 133726, 340909, 870213, 2223958, 5689807, 14571335, 37350585, 95821071, 246015677, 632088930, 1625119218, 4180845277, 10762096850, 27718352411, 71426753423, 184146711578]

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

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