A053518 - OEIS

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A053518 as a simple table

n	a(n)
0	1
1	5
2	23
3	45
4	925
5	7285
6	7195
7	641075
8	6993545
9	27779915
10	1077005935
11	15001154095
12	6788401045
13	3570274674605
14	60484653310955
15	40198648188145
16	1869525647793155
17	31559031031400605
18	2865359642850975565

[1,5,23,45,925,7285,7195,641075,6993545,27779915, 1077005935,15001154095,6788401045,3570274674605, 60484653310955,40198648188145,1869525647793155, 31559031031400605,2865359642850975565]