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A253409 as a simple table

na(n)
01
12
24
310
428
586
6282
7984
83630
914138
1057904
11248854
121118554
135246980
1425619018
15129961850
16683561488
173722029314
1820946195078
19121671375312
20728511702462
214491224518274
2228475638336144
23185499720543262
241240358846060122
258505894459387628
2659771243719783410

[1,2,4,10,28,86,282,984,3630,14138,57904,248854,
 1118554,5246980,25619018,129961850,683561488,
 3722029314,20946195078,121671375312,728511702462,
 4491224518274,28475638336144,185499720543262,
 1240358846060122,8505894459387628,
 59771243719783410]