A153670 - OEIS

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A153670 as a simple table

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	70
11	209
12	241
13	378
14	2697
15	4806
16	173389
17	529938
18	1334508
19	1572706
20	7840546
21	15896994
22	20204295
23	71074288
24	119325567

[1,2,3,4,5,6,7,8,9,70,209,241,378,2697,4806, 173389,529938,1334508,1572706,7840546,15896994, 20204295,71074288,119325567]