A219981 - OEIS

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A219981 as a simple table

n	a(n)
1	7
2	154
3	2344
4	34212
5	507655
6	7542829
7	111990804
8	1662706049
9	24686644236
10	366529445423
11	5441957364383
12	80798147898113
13	1199631049503365
14	17811233176117311
15	264447995737166473
16	3926327939543345163

[7,154,2344,34212,507655,7542829,111990804, 1662706049,24686644236,366529445423,5441957364383, 80798147898113,1199631049503365,17811233176117311, 264447995737166473,3926327939543345163]