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A306939 as a simple table

na(n)
01
19
245
3165
4495
51287
63003
76435
812870
924311
1043776
1175753
12127110
13209475
14346104
15591261
161081575
172163150
184686826
1910656387
2024582663
2156191734
22125640180
23273241161
24577147212
251184959314
262369918628
274631710931
288881943832
2916798969548
3031537530456

[1,9,45,165,495,1287,3003,6435,12870,24311,43776,
 75753,127110,209475,346104,591261,1081575,2163150,
 4686826,10656387,24582663,56191734,125640180,
 273241161,577147212,1184959314,2369918628,
 4631710931,8881943832,16798969548,31537530456]