A108716 - OEIS

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A108716 as a simple table

n	a(n)
0	3
1	21
2	371
3	7077
4	135779
5	2606261
6	50028755
7	960335173
8	18434276035
9	353858266965
10	6792546291251
11	130387472704741
12	2502874814474531
13	48044357383337973
14	922243598852422035
15	17703083191185355397

[3,21,371,7077,135779,2606261,50028755,960335173, 18434276035,353858266965,6792546291251, 130387472704741,2502874814474531, 48044357383337973,922243598852422035, 17703083191185355397]