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A147833 as a simple table

na(n)
01
10
20
312
412
560
6252
7636
82364
97932
1025020
1185116
12280380
13921084
143063996
1510112892
1633421884
17110641404
18365683644
191209311868
203999743292
2113225194492
2243735910076
23144633607548
24478279581756
251581644932860

[1,0,0,12,12,60,252,636,2364,7932,25020,85116,
 280380,921084,3063996,10112892,33421884,110641404,
 365683644,1209311868,3999743292,13225194492,
 43735910076,144633607548,478279581756,
 1581644932860]