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A063886 as a simple table

na(n)
01
12
22
34
46
512
620
740
870
9140
10252
11504
12924
131848
143432
156864
1612870
1725740
1848620
1997240
20184756
21369512
22705432
231410864
242704156
255408312
2610400600
2720801200
2840116600
2980233200
30155117520
31310235040
32601080390
331202160780

[1,2,2,4,6,12,20,40,70,140,252,504,924,1848,3432,
 6864,12870,25740,48620,97240,184756,369512,705432,
 1410864,2704156,5408312,10400600,20801200,
 40116600,80233200,155117520,310235040,601080390,
 1202160780]