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A219136 as a simple table

na(n)
12
26
318
451
5142
6405
71157
83289
99344
1026580
1175621
12215076
13611683
141739781
154948421
1614074414
1740030688
18113856507
19323834334
20921058929
212619701953
227451032833
2321192445976
2460276171664
25171439240421
26487612482144

[2,6,18,51,142,405,1157,3289,9344,26580,75621,
 215076,611683,1739781,4948421,14074414,40030688,
 113856507,323834334,921058929,2619701953,
 7451032833,21192445976,60276171664,171439240421,
 487612482144]