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A233481 as a simple table

n a(n)
0 0
1 1
2 4
3 21
4 144
5 1245
6 13140
7 164745
8 2399040
9 39834585
10 742940100
11 15374360925
12 349484058000
13 8654336615925
14 231842662751700
15 6679510641428625
16 205916703920928000
17 6762863294018456625
18 235719416966063530500
19 8689887736412502745125

[0,1,4,21,144,1245,13140,164745,2399040,39834585,
 742940100,15374360925,349484058000,8654336615925,
 231842662751700,6679510641428625,
 205916703920928000,6762863294018456625,
 235719416966063530500,8689887736412502745125]

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Last modified January 24 01:05 EST 2020. Contains 331178 sequences. (Running on oeis4.)