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A047142 as a simple table

na(n)
01
12
24
310
438
5142
6470
71576
85940
922714
1083456
11305088
121158606
134456076
1416946498
1564189932
16246350606
17952607962
183675557676
1914158562010
2054805236890
21213011072542
22828185178452
233219077811678
2412537974366478

[1,2,4,10,38,142,470,1576,5940,22714,83456,305088,
 1158606,4456076,16946498,64189932,246350606,
 952607962,3675557676,14158562010,54805236890,
 213011072542,828185178452,3219077811678,
 12537974366478]