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A047006 as a simple table

na(n)
01
12
25
316
453
5186
6665
72430
88981
933556
10126300
11478468
121821677
136965726
1426730639
15102895388
16397130997
171536321264
185955477230
1923128018490
2089962619148
21350442078972
221366907765382
235337995113404
2420868301796085

[1,2,5,16,53,186,665,2430,8981,33556,126300,
 478468,1821677,6965726,26730639,102895388,
 397130997,1536321264,5955477230,23128018490,
 89962619148,350442078972,1366907765382,
 5337995113404,20868301796085]