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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.

A191809 G.f. satisfies: A(x) = Sum_{n>=0} x^n*A(x)^binomial(n+2,3).

Table of values

n a(n)
0 1
1 1
2 2
3 7
4 32
5 174
6 1071
7 7281
8 53943
9 432555
10 3743146
11 34934853
12 351853883
13 3827477399
14 44985837602
15 570985992828
16 7814212692498
17 115024461077654
18 1815588345261996
19 30628743324667923
20 550414603283527315
21 10503650627005928698

List of values

[1, 1, 2, 7, 32, 174, 1071, 7281, 53943, 432555, 3743146, 34934853, 351853883, 3827477399, 44985837602, 570985992828, 7814212692498, 115024461077654, 1815588345261996, 30628743324667923, 550414603283527315, 10503650627005928698]

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

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