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A307525 as a simple table

n a(n)
0 1
1 1
2 4
3 21
4 146
5 1240
6 12479
7 144970
8 1908682
9 28079550
10 456458832
11 8125189974
12 157190542607
13 3284222304545
14 73705849847317
15 1768479436456975
16 45180024672023814
17 1224529894981726614
18 35096983241255523572
19 1060703070504583747430
20 33714045363258013414692

[1,1,4,21,146,1240,12479,144970,1908682,28079550,
 456458832,8125189974,157190542607,3284222304545,
 73705849847317,1768479436456975,45180024672023814,
 1224529894981726614,35096983241255523572,
 1060703070504583747430,33714045363258013414692]

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Last modified January 19 14:53 EST 2020. Contains 331049 sequences. (Running on oeis4.)