A014909 - OEIS

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A014909 as a simple table

n	a(n)
1	1
2	25
3	578
4	13298
5	305859
6	7034763
7	161799556
8	3721389796
9	85591965317
10	1968615202301
11	45278149652934
12	1041397442017494
13	23952141166402375
14	550899246827254639
15	12670682677026856712
16	291425701571617704392

[1,25,578,13298,305859,7034763,161799556, 3721389796,85591965317,1968615202301, 45278149652934,1041397442017494,23952141166402375, 550899246827254639,12670682677026856712, 291425701571617704392]