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A181955 as a simple table

na(n)
10
20
33
418
590
6390
72205
810878
945318
10256350
115530305
1255869330
13865551258
149892489698
1578223384785
16470010394350
1724530527675230
18409760923017198
1910595007772540113
20160826214447439770
211585844008081570650
2216787211082925012730
231362379219330719093273

[0,0,3,18,90,390,2205,10878,45318,256350,5530305,
 55869330,865551258,9892489698,78223384785,
 470010394350,24530527675230,409760923017198,
 10595007772540113,160826214447439770,
 1585844008081570650,16787211082925012730,
 1362379219330719093273]