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A273335 as a simple table

na(n)
01
14
248
3224
4960
53968
616128
765024
8261120
91046528
104190208
1116769024
1267092480
13268402688
141073676288
154294836224

[1,4,48,224,960,3968,16128,65024,261120,1046528,
 4190208,16769024,67092480,268402688,1073676288,
 4294836224]