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A013776 as a simple table

na(n)
02
132
2512
38192
4131072
52097152
633554432
7536870912
88589934592
9137438953472
102199023255552
1135184372088832
12562949953421312
139007199254740992
14144115188075855872
152305843009213693952

[2,32,512,8192,131072,2097152,33554432,536870912,
 8589934592,137438953472,2199023255552,
 35184372088832,562949953421312,9007199254740992,
 144115188075855872,2305843009213693952]