A233990 - OEIS

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A233990 as a simple table

n	a(n)
1	164
2	774
3	3496
4	17156
5	81200
6	409848
7	1995424
8	10261264
9	50945472
10	264997984
11	1333409408
12	6980548160
13	35444523776
14	186152208256
15	951061641728
16	5001337944320
17	25661802421248
18	134974683653632
19	694675975022592

[164,774,3496,17156,81200,409848,1995424,10261264, 50945472,264997984,1333409408,6980548160, 35444523776,186152208256,951061641728, 5001337944320,25661802421248,134974683653632, 694675975022592]