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A045890 as a simple table

na(n)
01
13
212
349
4204
5864
63714
716170
871178
9316303
101417248
116396273
1229051856
13132700725
14609200640
152809373915
1613008512040
1760457182345
18281919911460
191318666411635
206185356518660
2129088241615910
22137121834221346
23647821223533044
243066862717614234
2514546629647573969

[1,3,12,49,204,864,3714,16170,71178,316303,
 1417248,6396273,29051856,132700725,609200640,
 2809373915,13008512040,60457182345,281919911460,
 1318666411635,6185356518660,29088241615910,
 137121834221346,647821223533044,3066862717614234,
 14546629647573969]