A155435 - OEIS

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A155435 as a simple table

n	a(n)
4	1
5	4
6	13
7	28
8	49
9	105
10	852
11	6079
12	29814
13	128372
14	780418
15	9582912
16	132900511
17	1524452541
18	17253579386
19	257451880786
20	5763064779401
21	154341468962518

[1,4,13,28,49,105,852,6079,29814,128372,780418, 9582912,132900511,1524452541,17253579386, 257451880786,5763064779401,154341468962518]