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A028222 as a simple table

na(n)
01
136
2815
314850
4238161
53512376
648835795
7650202750
88376184421
9105168836916
101293777896775
1115655641961050
12186905779340281
132206620573868656
1425809833134389755
15299526474742773750

[1,36,815,14850,238161,3512376,48835795,650202750,
 8376184421,105168836916,1293777896775,
 15655641961050,186905779340281,2206620573868656,
 25809833134389755,299526474742773750]