A053519 - OEIS

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A053519 as a simple table

n	a(n)
0	1
1	3
2	15
3	29
4	597
5	4701
6	4643
7	413691
8	4512993
9	17926611
10	695000919
11	9680369943
12	4380611853
13	2303928046437
14	39031251610227
15	25940523189513
16	1206420504316107
17	20365306128628437
18	1849040492948486661

[1,3,15,29,597,4701,4643,413691,4512993,17926611, 695000919,9680369943,4380611853,2303928046437, 39031251610227,25940523189513,1206420504316107, 20365306128628437,1849040492948486661]