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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 55 |
| 5 | 190 |
| 6 | 699 |
| 7 | 2538 |
| 8 | 9573 |
| 9 | 36694 |
| 10 | 140881 |
| 11 | 552275 |
| 12 | 2175779 |
| 13 | 8624406 |
| 14 | 34558783 |
| 15 | 138884061 |
| 16 | 561597871 |
| 17 | 2284073680 |
| 18 | 9315683597 |
| 19 | 38180167051 |
| 20 | 157023821303 |
| 21 | 647586013452 |
| 22 | 2680241675239 |
| 23 | 11120381957470 |
| 24 | 46254888597609 |
| 25 | 192894174299418 |
| 26 | 806020664492243 |
| 27 | 3375225373534057 |
[1,2,5,17,55,190,699,2538,9573,36694,140881, 552275,2175779,8624406,34558783,138884061, 561597871,2284073680,9315683597,38180167051, 157023821303,647586013452,2680241675239, 11120381957470,46254888597609,192894174299418, 806020664492243,3375225373534057] |