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A223460 as a simple table

na(n)
121
260
3190
4600
51946
66264
720440
866208
9216452
10702768
112298936
127470944
1324444168
1479466336
15260022112
16845441152
172766427344
188995380672
1929434608608
2095712808320
21313191301792
221018418848640
233332470833536
2410836405217792

[21,60,190,600,1946,6264,20440,66208,216452,
 702768,2298936,7470944,24444168,79466336,
 260022112,845441152,2766427344,8995380672,
 29434608608,95712808320,313191301792,
 1018418848640,3332470833536,10836405217792]