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A303291 as a simple table

n a(n)
0 1
1 5
2 70
3 3170
4 252160
5 27705800
6 3806286820
7 621124623740
8 116766042046000
9 24783363325335440
10 5854493683431121840
11 1522701357625214096240
12 432347094526718807347480
13 133078785461406479045306360
14 44145742694332046133435657280
15 15702781293109570148744738306240
16 5962874290966165187708554294296880
17 2407878412120285331813837276575565360

[1,5,70,3170,252160,27705800,3806286820,
 621124623740,116766042046000,24783363325335440,
 5854493683431121840,1522701357625214096240,
 432347094526718807347480,
 133078785461406479045306360,
 44145742694332046133435657280,
 15702781293109570148744738306240,
 5962874290966165187708554294296880,
 2407878412120285331813837276575565360]

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Last modified December 4 19:40 EST 2021. Contains 349526 sequences. (Running on oeis4.)