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A224521 as a simple table

na(n)
00
11
23
37
415
531
662
7124
8248
9496
10992
111985
123971
137943
1415887
1531775
1663550
17127100
18254200
19508400
201016800
212033601
224067203
238134407
2416268815
2532537631
2665075262
27130150524
28260301048
29520602096
301041204192
312082408385
324164816771
338329633543

[0,1,3,7,15,31,62,124,248,496,992,1985,3971,7943,
 15887,31775,63550,127100,254200,508400,1016800,
 2033601,4067203,8134407,16268815,32537631,
 65075262,130150524,260301048,520602096,1041204192,
 2082408385,4164816771,8329633543]