A303470 - OEIS

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A303470 as a simple table

n	a(n)
1	4
2	32
3	170
4	948
5	5237
6	29009
7	160590
8	888993
9	4921496
10	27244949
11	150826626
12	834967061
13	4622327859
14	25588933014
15	141658809728
16	784214751260
17	4341366231543
18	24033545332699
19	133048277989004
20	736547356196655

[4,32,170,948,5237,29009,160590,888993,4921496, 27244949,150826626,834967061,4622327859, 25588933014,141658809728,784214751260, 4341366231543,24033545332699,133048277989004, 736547356196655]