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A006645 as a simple table

na(n)
00
10
21
34
414
544
6131
7376
81052
92888
107813
1120892
1255338
13145428
14379655
15985520
162545720
176547792
1816777993
1942847988
20109099078
21277040572
22701794187
231773851304
244474555476
2511266301976
2628318897549
2771070913036
28178106093666
29445740656420
301114147888655

[0,0,1,4,14,44,131,376,1052,2888,7813,20892,55338,
 145428,379655,985520,2545720,6547792,16777993,
 42847988,109099078,277040572,701794187,1773851304,
 4474555476,11266301976,28318897549,71070913036,
 178106093666,445740656420,1114147888655]