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A268088 as a simple table

na(n)
19
2243
34608
483349
51339893
620699712
7303284403
84320438183
959802048000
10811951057125
1110831783903677
12142591596848064
131855468989421875
1423920516469271231
15305928653301448704
163886833181740400197

[9,243,4608,83349,1339893,20699712,303284403,
 4320438183,59802048000,811951057125,
 10831783903677,142591596848064,1855468989421875,
 23920516469271231,305928653301448704,
 3886833181740400197]