A073377 - OEIS

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A073377 as a simple table

n	a(n)
0	1
1	8
2	52
3	264
4	1194
5	4872
6	18516
7	66264
8	226083
9	740608
10	2344232
11	7202416
12	21562164
13	63090288
14	180884088
15	509245776
16	1410356133
17	3848340312
18	10359516684
19	27544099704
20	72406891326
21	188356187448

[1,8,52,264,1194,4872,18516,66264,226083,740608, 2344232,7202416,21562164,63090288,180884088, 509245776,1410356133,3848340312,10359516684, 27544099704,72406891326,188356187448]