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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.

A383536 a(n) = Sum_{k=0..floor(n/2)} binomial(n+k,k)^2 * binomial(n-k,k).

Table of values

n a(n)
0 1
1 1
2 10
3 33
4 301
5 1468
6 12006
7 70945
8 548218
9 3588451
10 27033942
11 187329660
12 1398372925
13 10015968040
14 74666604910
15 545706810657
16 4076875022533
17 30186038308420
18 226302738440884
19 1690539173230083
20 12722171581599588
21 95650154853862786
22 722460110890588300

List of values

[1, 1, 10, 33, 301, 1468, 12006, 70945, 548218, 3588451, 27033942, 187329660, 1398372925, 10015968040, 74666604910, 545706810657, 4076875022533, 30186038308420, 226302738440884, 1690539173230083, 12722171581599588, 95650154853862786, 722460110890588300]

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

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