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A318760 as a simple table

na(n)
350
41150
5917990
627921250
727658786250
8890883616630
9953780917514270
1035292771610455205250
111188569463078058297390
1246461372967525788391551250
1354339408694585566675022336250
141865231796118578544316494648870
152211609309235145328175672372758350
1691503540845067670142505715662203731250

[50,1150,917990,27921250,27658786250,890883616630,
 953780917514270,35292771610455205250,
 1188569463078058297390,46461372967525788391551250,
 54339408694585566675022336250,
 1865231796118578544316494648870,
 2211609309235145328175672372758350,
 91503540845067670142505715662203731250]