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A252745 as a simple table

na(n)
00
10
21
33
46
515
626
757
8118
9237
10486
11989
121992
133997
148038
1516133
1632331
1764777
18129810
19260191
20521325
211043924
222089305
234180716

[0,0,1,3,6,15,26,57,118,237,486,989,1992,3997,
 8038,16133,32331,64777,129810,260191,521325,
 1043924,2089305,4180716]