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A270854 as a simple table

na(n)
10
20
32298
4307494
515754872
6469037376
78746813158
8121991495904
91213829981232
109734824653450
1161574400558324
12331178241244350
131508910046819356
146093153192888900
1521845378487998154
1671477509051004274

[0,0,2298,307494,15754872,469037376,8746813158,
 121991495904,1213829981232,9734824653450,
 61574400558324,331178241244350,1508910046819356,
 6093153192888900,21845378487998154,
 71477509051004274]