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A221593 as a simple table

n a(n)
1 0
2 16
3 44
4 256
5 1068
6 5082
7 22912
8 105586
9 482204
10 2210256
11 10115926
12 46327024
13 212107056
14 971225210
15 4446995942
16 20362020404
17 93233503292
18 426898240022
19 1954682503544
20 8950108307086
21 40980784959354
22 187642965834692

[0,16,44,256,1068,5082,22912,105586,482204,
 2210256,10115926,46327024,212107056,971225210,
 4446995942,20362020404,93233503292,426898240022,
 1954682503544,8950108307086,40980784959354,
 187642965834692]

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Last modified December 8 12:28 EST 2019. Contains 329862 sequences. (Running on oeis4.)