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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 19 |
| 3 | 95 |
| 4 | 319 |
| 5 | 1535 |
| 6 | 5119 |
| 7 | 24575 |
| 8 | 81919 |
| 9 | 393215 |
| 10 | 1310719 |
| 11 | 6291455 |
| 12 | 20971519 |
| 13 | 100663295 |
| 14 | 335544319 |
| 15 | 1610612735 |
| 16 | 5368709119 |
| 17 | 25769803775 |
| 18 | 85899345919 |
| 19 | 412316860415 |
| 20 | 1374389534719 |
| 21 | 6597069766655 |
| 22 | 21990232555519 |
| 23 | 105553116266495 |
| 24 | 351843720888319 |
[1,5,19,95,319,1535,5119,24575,81919,393215, 1310719,6291455,20971519,100663295,335544319, 1610612735,5368709119,25769803775,85899345919, 412316860415,1374389534719,6597069766655, 21990232555519,105553116266495,351843720888319] |