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.

A079225 Number of Catalan objects fixed by four-fold application of the Catalan bijections A057511/A057512 (Deep rotation of general parenthesizations/plane trees).

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 11
5 30
6 82
7 233
8 680
9 2033
10 6164
11 18923
12 58768
13 184045
14 581105
15 1846906
16 5905364
17 18980465
18 61292929
19 198758704
20 646974285
21 2113163707
22 6923642271
23 22749608810
24 74946337830
25 247499313730
26 819154110660
27 2716779932308

List of values

[1, 1, 2, 5, 11, 30, 82, 233, 680, 2033, 6164, 18923, 58768, 184045, 581105, 1846906, 5905364, 18980465, 61292929, 198758704, 646974285, 2113163707, 6923642271, 22749608810, 74946337830, 247499313730, 819154110660, 2716779932308]

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

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