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A121442 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 17 |
| 4 | 97 |
| 5 | 241 |
| 6 | 1097 |
| 7 | 3169 |
| 8 | 12801 |
| 9 | 40225 |
| 10 | 152265 |
| 11 | 501489 |
| 12 | 1831649 |
| 13 | 6192785 |
| 14 | 22176137 |
| 15 | 76079553 |
| 16 | 269472001 |
| 17 | 932011841 |
| 18 | 3281180297 |
| 19 | 11399814865 |
| 20 | 39998425697 |
| 21 | 139315579185 |
| 22 | 487901595593 |
| 23 | 1701743382561 |
| 24 | 5953542163713 |
| 25 | 20781331011169 |
| 26 | 72661467102025 |
[1,1,9,17,97,241,1097,3169,12801,40225,152265, 501489,1831649,6192785,22176137,76079553, 269472001,932011841,3281180297,11399814865, 39998425697,139315579185,487901595593, 1701743382561,5953542163713,20781331011169, 72661467102025] |