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A104987 as a simple table

na(n)
00
11
24
314
458
5300
61886
713878
8116310
91090500
1011296810
11128102714
121578342010
1320998804576
14300081098918
154584908039142
1674594230462318
171287634918033836
1823506502407089874
19452508152936326482

[0,1,4,14,58,300,1886,13878,116310,1090500,
 11296810,128102714,1578342010,20998804576,
 300081098918,4584908039142,74594230462318,
 1287634918033836,23506502407089874,
 452508152936326482]