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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.

A384950 a(n) = Sum_{k=0..n} 3^k * binomial(2*n+k-1,k).

Table of values

n a(n)
0 1
1 7
2 103
3 1720
4 30319
5 550867
6 10204660
7 191606380
8 3633593071
9 69434167357
10 1334845289023
11 25787841299392
12 500217562201348
13 9736067678711524
14 190051513661403112
15 3719197868485767940
16 72942019051301120239
17 1433317465944902210161
18 28212929859612197439829

List of values

[1, 7, 103, 1720, 30319, 550867, 10204660, 191606380, 3633593071, 69434167357, 1334845289023, 25787841299392, 500217562201348, 9736067678711524, 190051513661403112, 3719197868485767940, 72942019051301120239, 1433317465944902210161, 28212929859612197439829]

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

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