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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 34 |
| 6 | 131 |
| 7 | 544 |
| 8 | 2321 |
| 9 | 10219 |
| 10 | 45858 |
| 11 | 209422 |
| 12 | 969115 |
| 13 | 4536240 |
| 14 | 21435168 |
| 15 | 102120900 |
| 16 | 489966937 |
| 17 | 2365411849 |
| 18 | 11481936107 |
| 19 | 56005441585 |
| 20 | 274365808690 |
| 21 | 1349355995822 |
| 22 | 6659759051278 |
| 23 | 32975144338094 |
| 24 | 163753271207603 |
| 25 | 815384381782875 |
| 26 | 4070152108372400 |
| 27 | 20363490114853946 |
| 28 | 102097178305283104 |
| 29 | 512896449689275282 |
| 30 | 2581316849641991364 |
| 31 | 13013547947445475296 |
| 32 | 65712064033864711137 |
| 33 | 332312118095745844303 |
| 34 | 1682904769274022037513 |
[1,1,3,9,34,131,544,2321,10219,45858,209422, 969115,4536240,21435168,102120900,489966937, 2365411849,11481936107,56005441585,274365808690, 1349355995822,6659759051278,32975144338094, 163753271207603,815384381782875,4070152108372400, 20363490114853946,102097178305283104, 512896449689275282,2581316849641991364, 13013547947445475296,65712064033864711137, 332312118095745844303,1682904769274022037513] |