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A060955 as a simple table

na(n)
11
21
31
43
55
610
735
870
9216
10567
112310
125775
1321450
1469498
15243243
161153152
173620864
1816336320
1964664600
20249420600
21997682400
225462865408
2321422145536

[1,1,1,3,5,10,35,70,216,567,2310,5775,21450,69498,
 243243,1153152,3620864,16336320,64664600,
 249420600,997682400,5462865408,21422145536]