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A055588 as a simple table

na(n)
01
12
24
39
422
556
6145
7378
8988
92585
106766
1117712
1246369
13121394
14317812
15832041
162178310
175702888
1814930353
1939088170
20102334156
21267914297
22701408734
231836311904
244807526977
2512586269026
2632951280100
2786267571273

[1,2,4,9,22,56,145,378,988,2585,6766,17712,46369,
 121394,317812,832041,2178310,5702888,14930353,
 39088170,102334156,267914297,701408734,1836311904,
 4807526977,12586269026,32951280100,86267571273]