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A307321 as a simple table

na(n)
01
11
26
330
4143
5660
63000
713448
859696
9262788
101148738
114989908
1221551733
1392596511
14395921737
151685304092
167143861196
1730163965903
18126895681419
19531986033218
202222961809367
219260148591001
2238461580964389
23159302487751844
24658054630483936
252711429650817356

[1,1,6,30,143,660,3000,13448,59696,262788,1148738,
 4989908,21551733,92596511,395921737,1685304092,
 7143861196,30163965903,126895681419,531986033218,
 2222961809367,9260148591001,38461580964389,
 159302487751844,658054630483936,2711429650817356]