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A149121 as a simple table

na(n)
01
11
24
39
434
594
6368
71131
84398
914236
1055984
11188576
12740000
132551442
1410067316
1535443271
16139712062
17498416468
181971107420
197122847862
2028153558524
21102603939062
22406431688608
231494188962016
245916706122284
2521880889654074
2686779037261076
27322951842854822
281280521402780940
294786287052515392

[1,1,4,9,34,94,368,1131,4398,14236,55984,188576,
 740000,2551442,10067316,35443271,139712062,
 498416468,1971107420,7122847862,28153558524,
 102603939062,406431688608,1494188962016,
 5916706122284,21880889654074,86779037261076,
 322951842854822,1280521402780940,4786287052515392]