A022746 - OEIS

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A022746 as a simple table

n	a(n)
0	1
1	22
2	297
3	3058
4	26334
5	198748
6	1353275
7	8474202
8	49475074
9	272055454
10	1420063656
11	7079791314
12	33881645721
13	156287683310
14	697257244178
15	3017396237922
16	12697675601127
17	52071958360466
18	208490926189117

[1,22,297,3058,26334,198748,1353275,8474202, 49475074,272055454,1420063656,7079791314, 33881645721,156287683310,697257244178, 3017396237922,12697675601127,52071958360466, 208490926189117]