A145666 - OEIS

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A145666 as a simple table

n	a(n)
1	0
2	7
3	105
4	2219
5	31087
6	1088129
7	2538991
8	17772957
9	248821433
10	15675750559
11	21946050833
12	1689845914645
13	11828921402977
14	1076431847676451
15	7535022933740305
16	263725802680934699
17	3692161237533130831

[0,7,105,2219,31087,1088129,2538991,17772957, 248821433,15675750559,21946050833,1689845914645, 11828921402977,1076431847676451,7535022933740305, 263725802680934699,3692161237533130831]