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.

A120010 G.f.: A(x) = (1-sqrt(1-4*x))/2 o x/(1-x) o (x-x^2), a composition of functions involving the Catalan function and its inverse.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 6
6 18
7 53
8 158
9 481
10 1491
11 4688
12 14913
13 47913
14 155261
15 506881
16 1665643
17 5504988
18 18287338
19 61027991
20 204499397
21 687808931
22 2321177071
23 7857504876
24 26673769002
25 90783820081
26 309720079813
27 1058984020333
28 3628267267358

List of values

[1, 1, 1, 2, 6, 18, 53, 158, 481, 1491, 4688, 14913, 47913, 155261, 506881, 1665643, 5504988, 18287338, 61027991, 204499397, 687808931, 2321177071, 7857504876, 26673769002, 90783820081, 309720079813, 1058984020333, 3628267267358]

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

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