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A306409 as a simple table

na(n)
00
11
23
310
434
5120
6434
71597
85949
922363
1084655
11322245
121232205
134729453
1418210279
1570307546
16272087770
171055139408
184099200524
1915951053566
2062159391150
21242542955378
22947504851414
233705431067156
2414505084243860
2556831711106496
26222853334131080

[0,1,3,10,34,120,434,1597,5949,22363,84655,322245,
 1232205,4729453,18210279,70307546,272087770,
 1055139408,4099200524,15951053566,62159391150,
 242542955378,947504851414,3705431067156,
 14505084243860,56831711106496,222853334131080]