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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.

A387476 a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(k,n-2*k)^2.

Table of values

n a(n)
0 1
1 0
2 2
3 2
4 4
5 16
6 12
7 72
8 88
9 264
10 608
11 1056
12 3280
13 5504
14 15328
15 31904
16 71104
17 175488
18 358080
19 900736
20 1925248
21 4518016
22 10404864
23 23138304
24 54970624
25 122038272
26 286077440
27 651510272
28 1492685824
29 3465687040
30 7876488192
31 18322630656
32 41904609280
33 96788580352
34 223335882752

List of values

[1, 0, 2, 2, 4, 16, 12, 72, 88, 264, 608, 1056, 3280, 5504, 15328, 31904, 71104, 175488, 358080, 900736, 1925248, 4518016, 10404864, 23138304, 54970624, 122038272, 286077440, 651510272, 1492685824, 3465687040, 7876488192, 18322630656, 41904609280, 96788580352, 223335882752]

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

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