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A191681 as a simple table

n a(n)
0 0
1 4
2 40
3 364
4 3280
5 29524
6 265720
7 2391484
8 21523360
9 193710244
10 1743392200
11 15690529804
12 141214768240
13 1270932914164
14 11438396227480
15 102945566047324
16 926510094425920
17 8338590849833284
18 75047317648499560
19 675425858836496044

[0,4,40,364,3280,29524,265720,2391484,21523360,
 193710244,1743392200,15690529804,141214768240,
 1270932914164,11438396227480,102945566047324,
 926510094425920,8338590849833284,
 75047317648499560,675425858836496044]

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Last modified October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)