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A209298 as a simple table

na(n)
01
11
20
34
46
530
6348
71580
812516
9114884
101375776
1112239280
12160067160
131966619512
1428104385008
15428735710000
166769181533968
17110402248461840
182070626881211136
1938342125010072384
20764180537501729376
2116185744192232110560
22354756690964676468160

[1,1,0,4,6,30,348,1580,12516,114884,1375776,
 12239280,160067160,1966619512,28104385008,
 428735710000,6769181533968,110402248461840,
 2070626881211136,38342125010072384,
 764180537501729376,16185744192232110560,
 354756690964676468160]