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A146300 as a simple table

na(n)
20
31
41640
5123744
61546356
79282128
837896264
9121782952
10331901924
11801191922
121761200680
133592793804
146894127812
1512569395174

[0,1,1640,123744,1546356,9282128,37896264,
 121782952,331901924,801191922,1761200680,
 3592793804,6894127812,12569395174]