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A305915 as a simple table

na(n)
18
257
362
4347
52014
68135
757465
8489154
93344053
1025522176
11209490803
121611464796
1312539285595
1499907700990
15785210139974
166162648831419
1748680431762971
18383689003675080
193020361523395059
2023812409080409828

[8,57,62,347,2014,8135,57465,489154,3344053,
 25522176,209490803,1611464796,12539285595,
 99907700990,785210139974,6162648831419,
 48680431762971,383689003675080,3020361523395059,
 23812409080409828]