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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.

A335309 a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+k,k) * n^(n-k).

Table of values

n a(n)
0 1
1 3
2 22
3 245
4 3606
5 65527
6 1411404
7 35066313
8 985483270
9 30869546411
10 1065442493556
11 40144438269949
12 1638733865336764
13 72012798200637855
14 3388250516614331416
15 169894851136173584145
16 9041936334960057699654
17 508945841697238471315027
18 30202327515992972576218980

List of values

[1, 3, 22, 245, 3606, 65527, 1411404, 35066313, 985483270, 30869546411, 1065442493556, 40144438269949, 1638733865336764, 72012798200637855, 3388250516614331416, 169894851136173584145, 9041936334960057699654, 508945841697238471315027, 30202327515992972576218980]

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

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