A145345 - OEIS

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A145345 as a simple table

n	a(n)
0	1
1	1
2	2
3	7
4	34
5	203
6	1398
7	10706
8	89120
9	794347
10	7502170
11	74511150
12	773864654
13	8368430208
14	93905460014
15	1090519614152
16	13077315637592
17	161643281777801
18	2056306418177832
19	26887064722265250
20	360939404438509866

[1,1,2,7,34,203,1398,10706,89120,794347,7502170, 74511150,773864654,8368430208,93905460014, 1090519614152,13077315637592,161643281777801, 2056306418177832,26887064722265250, 360939404438509866]