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A020537 as a simple table

na(n)
01
126
2244
32024
416336
5130976
61048384
78388224
867108096
9536869376
104294964224
1134359732224
12274877894656
132199023230976
1417592185995264
15140737488257024
161125899906646016
179007199254347776
1872057594037141504
19576460752301850624
204611686018424242176

[1,26,244,2024,16336,130976,1048384,8388224,
 67108096,536869376,4294964224,34359732224,
 274877894656,2199023230976,17592185995264,
 140737488257024,1125899906646016,9007199254347776,
 72057594037141504,576460752301850624,
 4611686018424242176]