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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 59 |
| 5 | 187 |
| 6 | 883 |
| 7 | 3169 |
| 8 | 14959 |
| 9 | 56465 |
| 10 | 270401 |
| 11 | 1067643 |
| 12 | 5138107 |
| 13 | 20768155 |
| 14 | 100531397 |
| 15 | 415371639 |
| 16 | 2018477663 |
| 17 | 8463235109 |
| 18 | 41253849485 |
| 19 | 175193128703 |
| 20 | 856236442631 |
| 21 | 3673538468941 |
| 22 | 17990245877423 |
| 23 | 77839901320289 |
| 24 | 381879487570937 |
| 25 | 1664511334644829 |
| 26 | 8177969008270369 |
| 27 | 35866951221369105 |
[1,1,5,13,59,187,883,3169,14959,56465,270401, 1067643,5138107,20768155,100531397,415371639, 2018477663,8463235109,41253849485,175193128703, 856236442631,3673538468941,17990245877423, 77839901320289,381879487570937,1664511334644829, 8177969008270369,35866951221369105] |