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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.

A383118 a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(3*k,k).

Table of values

n a(n)
0 1
1 2
2 10
3 47
4 238
5 1232
6 6499
7 34715
8 187198
9 1016840
10 5555560
11 30497150
12 168073195
13 929348396
14 5153362231
15 28646281502
16 159579236014
17 890644144580
18 4979200476088
19 27878225498030
20 156298588113088
21 877350590047496
22 4930273302851830
23 27733610884176338

List of values

[1, 2, 10, 47, 238, 1232, 6499, 34715, 187198, 1016840, 5555560, 30497150, 168073195, 929348396, 5153362231, 28646281502, 159579236014, 890644144580, 4979200476088, 27878225498030, 156298588113088, 877350590047496, 4930273302851830, 27733610884176338]

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

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