A107669 - OEIS

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A107669 as a simple table

n	a(n)
0	1
1	1
2	5
3	51
4	809
5	17575
6	486460
7	16384260
8	650574249
9	29762953831
10	1541719486081
11	89201504309927
12	5702038255950404
13	399105271607867940
14	30359621863987241460
15	2494052823831234355340
16	220067051126228849480649

[1,1,5,51,809,17575,486460,16384260,650574249, 29762953831,1541719486081,89201504309927, 5702038255950404,399105271607867940, 30359621863987241460,2494052823831234355340, 220067051126228849480649]