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A270935 as a simple table

na(n)
01
18
244
3220
4956
53964
616124
765020
8261116
91046524
104190204
1116769020
1267092476
13268402684
141073676284
154294836220

[1,8,44,220,956,3964,16124,65020,261116,1046524,
 4190204,16769020,67092476,268402684,1073676284,
 4294836220]