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A149273 as a simple table

na(n)
01
11
24
311
442
5132
6520
71761
86970
924604
1097740
11353886
121408456
135186830
1420673334
1577060191
16307402490
171156225566
184615394884
1917481280422
2069812708258
21265891539128
221062228300604
234063922007022
2416239378774724
2562361864245180
26249247207795482
27960167359575770
283838172631009646

[1,1,4,11,42,132,520,1761,6970,24604,97740,353886,
 1408456,5186830,20673334,77060191,307402490,
 1156225566,4615394884,17481280422,69812708258,
 265891539128,1062228300604,4063922007022,
 16239378774724,62361864245180,249247207795482,
 960167359575770,3838172631009646]