A057408 - OEIS

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A057408 as a simple table

n	a(n)
18	10
19	212
20	2530
21	22640
22	169906
23	1131904
24	6920388
25	39668532
26	216315230
27	1133876128
28	5757104542
29	28478125312
30	137854314576
31	655307492388
32	3067528095994
33	14171567365156
34	64732059542906
35	292778085749036

[10,212,2530,22640,169906,1131904,6920388, 39668532,216315230,1133876128,5757104542, 28478125312,137854314576,655307492388, 3067528095994,14171567365156,64732059542906, 292778085749036]