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A306356 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 9
5 48
6 250
7 1760
8 12502
9 111776
10 1017060
11 11165280
12 123760560
13 1602344832
14 21025461600
15 314958758400
16 4765553385120
17 80958196300800
18 1386261729792960
19 26344715667079680
20 502986050203680000
21 10556482426015426560
22 222685725334400064000

[1,1,1,2,9,48,250,1760,12502,111776,1017060,
 11165280,123760560,1602344832,21025461600,
 314958758400,4765553385120,80958196300800,
 1386261729792960,26344715667079680,
 502986050203680000,10556482426015426560,
 222685725334400064000]

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Last modified June 3 03:59 EDT 2020. Contains 334793 sequences. (Running on oeis4.)