A220321 - OEIS

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A220321 as a simple table

n	a(n)
1	7
2	132
3	1887
4	32077
5	516966
6	8191676
7	129313715
8	2038349283
9	32021593670
10	502699746654
11	7886869828691
12	123689257996713
13	1939445941518783
14	30407283622710054
15	476704179386550779
16	7473178447882102229

[7,132,1887,32077,516966,8191676,129313715, 2038349283,32021593670,502699746654,7886869828691, 123689257996713,1939445941518783, 30407283622710054,476704179386550779, 7473178447882102229]