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A284840 as a simple table

na(n)
01
15
218
363
4224
5799
62846
710132
836073
9128438
10457304
111628224
125797263
1320641062
1473492179
15261667749
16931663897
173317174627
1811810748015
1942051982296
20149725420655
21533095002085
221898076358760
236758070980980
2424062005289281
2585672390859855

[1,5,18,63,224,799,2846,10132,36073,128438,457304,
 1628224,5797263,20641062,73492179,261667749,
 931663897,3317174627,11810748015,42051982296,
 149725420655,533095002085,1898076358760,
 6758070980980,24062005289281,85672390859855]