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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.

A383524 a(n) = Sum_{k=0..floor(n/2)} binomial(n,k) * binomial(n-k,k)^2.

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 43
5 171
6 711
7 2913
8 12363
9 53203
10 230593
11 1010703
12 4463119
13 19827679
14 88594299
15 397741893
16 1793063883
17 8113429419
18 36832823289
19 167701920759
20 765577205433
21 3503296744233
22 16065995216109
23 73824301464939
24 339844364816559
25 1567063753104471
26 7237078197034221

List of values

[1, 1, 3, 13, 43, 171, 711, 2913, 12363, 53203, 230593, 1010703, 4463119, 19827679, 88594299, 397741893, 1793063883, 8113429419, 36832823289, 167701920759, 765577205433, 3503296744233, 16065995216109, 73824301464939, 339844364816559, 1567063753104471, 7237078197034221]

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

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