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A135413 as a simple table

na(n)
11
22
36
420
570
6246
7875
83144
911385
1041470
11151778
12557712
132056210
147602700
1528180050
16104677280
17389571983
181452293766
195422187130
2020271296100
2175878518695
22284339792110
231066585128810
244004566131000
2515048213795600

[1,2,6,20,70,246,875,3144,11385,41470,151778,
 557712,2056210,7602700,28180050,104677280,
 389571983,1452293766,5422187130,20271296100,
 75878518695,284339792110,1066585128810,
 4004566131000,15048213795600]