A094418 - OEIS

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A094418 as a simple table

n	a(n)
0	1
1	5
2	55
3	905
4	19855
5	544505
6	17919055
7	687978905
8	30187495855
9	1490155456505
10	81732269223055
11	4931150091426905
12	324557348772511855
13	23141780973332248505
14	1776997406800302687055
15	146197529083891406394905

[1,5,55,905,19855,544505,17919055,687978905, 30187495855,1490155456505,81732269223055, 4931150091426905,324557348772511855, 23141780973332248505,1776997406800302687055, 146197529083891406394905]