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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.

A383832 a(n) = Sum_{k=0..n} (k+1) * 3^k * binomial(2*n+2,n-k).

Table of values

n a(n)
0 1
1 10
2 78
3 548
4 3630
5 23148
6 143724
7 874888
8 5245038
9 31065500
10 182189348
11 1059775608
12 6122246572
13 35160205752
14 200902089240
15 1142857957392
16 6475994731758
17 36569545322364
18 205869970843764
19 1155749458070040
20 6472151016349284
21 36161680227612456
22 201628061114911848

List of values

[1, 10, 78, 548, 3630, 23148, 143724, 874888, 5245038, 31065500, 182189348, 1059775608, 6122246572, 35160205752, 200902089240, 1142857957392, 6475994731758, 36569545322364, 205869970843764, 1155749458070040, 6472151016349284, 36161680227612456, 201628061114911848]

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

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