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A047074 as a simple table

na(n)
01
11
23
32
45
56
614
720
845
970
10154
11252
12546
13924
141980
153432
167293
1712870
1827170
1948620
20102102
21184756
22386308
23705432
241469650
252704156
265616324
2710400600
2821544100
2940116600
3082907640
31155117520
32319929885
33601080390
341237518450

[1,1,3,2,5,6,14,20,45,70,154,252,546,924,1980,
 3432,7293,12870,27170,48620,102102,184756,386308,
 705432,1469650,2704156,5616324,10400600,21544100,
 40116600,82907640,155117520,319929885,601080390,
 1237518450]