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A111297 as a simple table

na(n)
01
12
25
311
424
552
6112
7240
8512
91088
102304
114864
1210240
1321504
1445056
1594208
16196608
17409600
18851968
191769472
203670016
217602176
2215728640
2332505856
2467108864
25138412032
26285212672
27587202560
281207959552
292483027968
305100273664

[1,2,5,11,24,52,112,240,512,1088,2304,4864,10240,
 21504,45056,94208,196608,409600,851968,1769472,
 3670016,7602176,15728640,32505856,67108864,
 138412032,285212672,587202560,1207959552,
 2483027968,5100273664]