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A099177 as a simple table

n a(n)
0 0
1 1
2 2
3 8
4 20
5 60
6 160
7 448
8 1216
9 3344
10 9120
11 24960
12 68160
13 186304
14 508928
15 1390592
16 3799040
17 10379520
18 28357120
19 77473792
20 211661824
21 578272256
22 1579868160
23 4316282880
24 11792302080
25 32217174016
26 88018952192
27 240472260608

[0,1,2,8,20,60,160,448,1216,3344,9120,24960,68160,
 186304,508928,1390592,3799040,10379520,28357120,
 77473792,211661824,578272256,1579868160,
 4316282880,11792302080,32217174016,88018952192,
 240472260608]

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Last modified January 28 03:49 EST 2020. Contains 331317 sequences. (Running on oeis4.)