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A148931 as a simple table

na(n)
01
11
23
39
428
596
6331
71178
84277
915668
1058207
11217827
12820822
133113057
1411858060
1545369618
16174201971
17670880989
182590897603
1910028967336
2038902441680
21151185031351
22588509650239
232294305412573
248956328591359
2535005542995118
26136969955527081
27536476427847843
282103186073322950

[1,1,3,9,28,96,331,1178,4277,15668,58207,217827,
 820822,3113057,11858060,45369618,174201971,
 670880989,2590897603,10028967336,38902441680,
 151185031351,588509650239,2294305412573,
 8956328591359,35005542995118,136969955527081,
 536476427847843,2103186073322950]