A073545 - OEIS

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A073545 as a simple table

n	a(n)
0	1
1	2
2	6
3	25
4	54
5	243
6	1204
7	3549
8	19544
9	81829
10	104663
11	663490
12	743764
13	7925355
14	15376922
15	39462786
16	201432540
17	1187707803
18	3034296474
19	8657654859
20	48511905236
21	154669032693
22	123533546264

[1,2,6,25,54,243,1204,3549,19544,81829,104663, 663490,743764,7925355,15376922,39462786,201432540, 1187707803,3034296474,8657654859,48511905236, 154669032693,123533546264]