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A136509 as a simple table

na(n)
01
12
26
316
450
5171
6697
73416
821126
9169105
101794683
1125891713
12507686588
1313878639286
14518836271475
1527356839451662
161968958300103603
17200935638262212462
1827892630019328034846
195502857784211927305980

[1,2,6,16,50,171,697,3416,21126,169105,1794683,
 25891713,507686588,13878639286,518836271475,
 27356839451662,1968958300103603,
 200935638262212462,27892630019328034846,
 5502857784211927305980]