A111994 - OEIS

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A111994 as a simple table

n	a(n)
0	1
1	6
2	33
3	176
4	930
5	4908
6	25954
7	137712
8	733539
9	3922834
10	21060099
11	113481504
12	613619332
13	3328768344
14	18112655748
15	98833261600
16	540705999621
17	2965360687518
18	16299708148901
19	89784615643728
20	495545294427558

[1,6,33,176,930,4908,25954,137712,733539,3922834, 21060099,113481504,613619332,3328768344, 18112655748,98833261600,540705999621, 2965360687518,16299708148901,89784615643728, 495545294427558]