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A006149 as a simple table

n a(n)
0 1
1 1
2 4
3 30
4 330
5 4719
6 81796
7 1643356
8 37119160
9 922268360
10 24801924512
11 713055329720
12 21706243125300
13 694280570551875
14 23188541161342500
15 804601696647424500
16 28880966163870711000
17 1068595748063216307000
18 40631980618055892780000
19 1583603339463794983230000

[1,1,4,30,330,4719,81796,1643356,37119160,
 922268360,24801924512,713055329720,21706243125300,
 694280570551875,23188541161342500,
 804601696647424500,28880966163870711000,
 1068595748063216307000,40631980618055892780000,
 1583603339463794983230000]

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Last modified April 25 09:18 EDT 2024. Contains 371967 sequences. (Running on oeis4.)