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A268147 as a simple table

na(n)
00
116
2512
312288
4262144
55242880
6100663296
71879048192
834359738368
9618475290624
1010995116277760
11193514046488576
123377699720527872
1358546795155816448
141008806316530991104
1517293822569102704640
16295147905179352825856
175017514388048998039552

[0,16,512,12288,262144,5242880,100663296,
 1879048192,34359738368,618475290624,
 10995116277760,193514046488576,3377699720527872,
 58546795155816448,1008806316530991104,
 17293822569102704640,295147905179352825856,
 5017514388048998039552]