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A149918 as a simple table

na(n)
01
12
25
315
447
5155
6550
72035
87722
929985
10118765
11479168
121964860
138163456
1434289654
15145407531
16622140088
172684352052
1811668740663
1951051121400
20224634027148
21993743689121
224418607853426
2319739660278386
2488559523924740
25398844406130059
261802754697899622
278176336856042439

[1,2,5,15,47,155,550,2035,7722,29985,118765,
 479168,1964860,8163456,34289654,145407531,
 622140088,2684352052,11668740663,51051121400,
 224634027148,993743689121,4418607853426,
 19739660278386,88559523924740,398844406130059,
 1802754697899622,8176336856042439]