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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 63 |
| 5 | 253 |
| 6 | 1033 |
| 7 | 4255 |
| 8 | 17935 |
| 9 | 76417 |
| 10 | 328111 |
| 11 | 1422019 |
| 12 | 6205767 |
| 13 | 27220843 |
| 14 | 120065915 |
| 15 | 531976191 |
| 16 | 2365738953 |
| 17 | 10559780719 |
| 18 | 47286444233 |
| 19 | 212333994419 |
| 20 | 956041766143 |
| 21 | 4315020289809 |
| 22 | 19517499482841 |
| 23 | 88463974798857 |
| 24 | 401726989350349 |
| 25 | 1827449753524945 |
| 26 | 8326788750143589 |
| 27 | 37999196458199753 |
[1,1,5,17,63,253,1033,4255,17935,76417,328111, 1422019,6205767,27220843,120065915,531976191, 2365738953,10559780719,47286444233,212333994419, 956041766143,4315020289809,19517499482841, 88463974798857,401726989350349,1827449753524945, 8326788750143589,37999196458199753] |