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A187987 as a simple table

na(n)
10
28
317
472
5267
6915
73407
812148
943820
10158361
11570132
122058621
137429283
1426823311
1596904923
16350182773
171266059030
184579170527
1916568732508
2059974168593
21217170088270
22786671363225
232850611975840
2410333040668513
2537467797814236
26135900958160905

[0,8,17,72,267,915,3407,12148,43820,158361,570132,
 2058621,7429283,26823311,96904923,350182773,
 1266059030,4579170527,16568732508,59974168593,
 217170088270,786671363225,2850611975840,
 10333040668513,37467797814236,135900958160905]