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A206460 as a simple table

na(n)
18
25157
3256012
49746876
5362750400
613841186359
7549755617280
822876792100667
9999999999400000
1045949729862605855
112218611106738944000
12112455406951955165371
135976303958948911170240
14332525673007965083334375

[8,5157,256012,9746876,362750400,13841186359,
 549755617280,22876792100667,999999999400000,
 45949729862605855,2218611106738944000,
 112455406951955165371,5976303958948911170240,
 332525673007965083334375]