A045492 - OEIS

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A045492 as a simple table

n	a(n)
0	1
1	19
2	218
3	1955
4	15086
5	105102
6	679764
7	4154403
8	24281510
9	136887322
10	749032492
11	3997228430
12	20880823820
13	107088473660
14	540472210728
15	2689562860323
16	13217998697430
17	64240718824930
18	309108505173820

[1,19,218,1955,15086,105102,679764,4154403, 24281510,136887322,749032492,3997228430, 20880823820,107088473660,540472210728, 2689562860323,13217998697430,64240718824930, 309108505173820]