A024721 - OEIS

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A024721 as a simple table

n	a(n)
0	1
1	2
2	11
3	102
4	1071
5	11697
6	130452
7	1475356
8	16856293
9	194088920
10	2248544554
11	26179257724
12	306051026719
13	3590265729775
14	42241017111607
15	498243554454823
16	5889887780556528
17	69761293355975193
18	827690921897694948

[1,2,11,102,1071,11697,130452,1475356,16856293, 194088920,2248544554,26179257724,306051026719, 3590265729775,42241017111607,498243554454823, 5889887780556528,69761293355975193, 827690921897694948]