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A148254 as a simple table

na(n)
01
11
22
34
413
538
6142
7495
81999
97639
1032410
11131732
12578108
132451480
1411019463
1548167875
16220369210
17985213006
184568163974
1920777640886
2097351386710
21448791075548
222120304847549
239880144320349
2446993584507492
25220893243761056
261056471472307132
275001575487300376
2824031415726411821

[1,1,2,4,13,38,142,495,1999,7639,32410,131732,
 578108,2451480,11019463,48167875,220369210,
 985213006,4568163974,20777640886,97351386710,
 448791075548,2120304847549,9880144320349,
 46993584507492,220893243761056,1056471472307132,
 5001575487300376,24031415726411821]