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A218684 as a simple table

na(n)
01
10
21
32
47
518
696
7260
81851
95270
1046515
11137942
121447202
134433772
1453787706
15169169912
162326986783
177477418982
18114916173009
19375898894514
206380455164161
2121185872231238
22393499602818322
231323362744628080
2426691270481453228
2590755667374332324

[1,0,1,2,7,18,96,260,1851,5270,46515,137942,
 1447202,4433772,53787706,169169912,2326986783,
 7477418982,114916173009,375898894514,
 6380455164161,21185872231238,393499602818322,
 1323362744628080,26691270481453228,
 90755667374332324]