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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.

A387483 a(n) = Sum_{k=0..floor(n/2)} 2^(n-k) * binomial(k,n-2*k)^2.

Table of values

n a(n)
0 1
1 0
2 2
3 4
4 4
5 32
6 24
7 144
8 304
9 576
10 2336
11 3648
12 13120
13 30208
14 70528
15 218368
16 456448
17 1360896
18 3316224
19 8311808
20 23127040
21 54812672
22 151197696
23 380669952
24 978595840
25 2613067776
26 6540566528
27 17464705024
28 44764708864
29 116183662592
30 305637064704
31 783627386880

List of values

[1, 0, 2, 4, 4, 32, 24, 144, 304, 576, 2336, 3648, 13120, 30208, 70528, 218368, 456448, 1360896, 3316224, 8311808, 23127040, 54812672, 151197696, 380669952, 978595840, 2613067776, 6540566528, 17464705024, 44764708864, 116183662592, 305637064704, 783627386880]

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

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