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A281566 as a simple table

na(n)
10
26
3815
43374
512133
631300
767834
8136056
9264286
10498750
11924374
121694678
133076872
145538752
159905630
1617619912
1731184144
1854940940
1996415390
20168598070
21293855280
22510636866
23884919690
241529682370
252638054884
264539684028

[0,6,815,3374,12133,31300,67834,136056,264286,
 498750,924374,1694678,3076872,5538752,9905630,
 17619912,31184144,54940940,96415390,168598070,
 293855280,510636866,884919690,1529682370,
 2638054884,4539684028]