A158196 - OEIS

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A158196 as a simple table

n	a(n)
0	1
1	3
2	14
3	71
4	370
5	1950
6	10332
7	54895
8	292106
9	1555706
10	8289732
11	44186710
12	235575028
13	1256093084
14	6698073528
15	35719158591
16	190488112122
17	1015885525794
18	5417869631028
19	28894620083346
20	154102115782812

[1,3,14,71,370,1950,10332,54895,292106,1555706, 8289732,44186710,235575028,1256093084,6698073528, 35719158591,190488112122,1015885525794, 5417869631028,28894620083346,154102115782812]