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A180488 as a simple table

na(n)
10
21
33
49
523
660
7152
8388
9984
102501
116347
1216117
1340911
14103864
15263664
16669352
171699216
184313673
1910950739
2027799745
2170572839
22179157364
23454811656
241154592108
252931065640
267440849549
2718889457819
2847953075565

[0,1,3,9,23,60,152,388,984,2501,6347,16117,40911,
 103864,263664,669352,1699216,4313673,10950739,
 27799745,70572839,179157364,454811656,1154592108,
 2931065640,7440849549,18889457819,47953075565]