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A221189 as a simple table

na(n)
11
231
3318
43605
539851
6441912
74896043
854248371
9601050906
106659404865
1173783381595
12817488259440
139057417947527
14100352286120727
151111860046543146
1612318929680916909
17136488426454208783
181512232882805726640

[1,31,318,3605,39851,441912,4896043,54248371,
 601050906,6659404865,73783381595,817488259440,
 9057417947527,100352286120727,1111860046543146,
 12318929680916909,136488426454208783,
 1512232882805726640]