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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.

A387309 a(n) = Sum_{k=0..n} 3^k * binomial(n+1,k+1) * binomial(2*k+2,k+2).

Table of values

n a(n)
0 1
1 14
2 174
3 2128
4 26045
5 320082
6 3951493
7 48987848
8 609592347
9 7610525650
10 95287524332
11 1196054790168
12 15046318739803
13 189654839753750
14 2394743468261190
15 30285593026553536
16 383554551776056139
17 4863775493104574634
18 61748210178809072722
19 784757334938247965840
20 9983152795673915802399

List of values

[1, 14, 174, 2128, 26045, 320082, 3951493, 48987848, 609592347, 7610525650, 95287524332, 1196054790168, 15046318739803, 189654839753750, 2394743468261190, 30285593026553536, 383554551776056139, 4863775493104574634, 61748210178809072722, 784757334938247965840, 9983152795673915802399]

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

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