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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.

A371742 a(n) = Sum_{k=0..floor(n/2)} binomial(3*n-k,n-2*k).

Table of values

n a(n)
0 1
1 3
2 16
3 92
4 551
5 3380
6 21065
7 132771
8 843944
9 5399802
10 34731776
11 224361283
12 1454557294
13 9458829681
14 61670895633
15 403003997300
16 2638776935215
17 17308508054848
18 113709379928689
19 748069400432262
20 4927608724973776
21 32495826854732633
22 214521754579553129

List of values

[1, 3, 16, 92, 551, 3380, 21065, 132771, 843944, 5399802, 34731776, 224361283, 1454557294, 9458829681, 61670895633, 403003997300, 2638776935215, 17308508054848, 113709379928689, 748069400432262, 4927608724973776, 32495826854732633, 214521754579553129]

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

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