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A245852 as a simple table

na(n)
11
28
364
4512
532768
6262144
716777216
8134217728
98589934592
1068719476736
11549755813888
122251799813685248
134722366482869645213696
142417851639229258349412352

[1,8,64,512,32768,262144,16777216,134217728,
 8589934592,68719476736,549755813888,
 2251799813685248,4722366482869645213696,
 2417851639229258349412352]