A124843 - OEIS

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A124843 as a simple table

n	a(n)
0	1
1	8
2	34
3	122
4	502
5	2098
6	8980
7	38928
8	170382
9	750722
10	3323554
11	14763438
12	65736004
13	293186252
14	1309156946
15	5850527002
16	26160514526
17	117022825786
18	523619082772
19	2343388805944
20	10488943094022
21	46952619517170

[1,8,34,122,502,2098,8980,38928,170382,750722, 3323554,14763438,65736004,293186252,1309156946, 5850527002,26160514526,117022825786,523619082772, 2343388805944,10488943094022,46952619517170]