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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 26 |
| 4 | 104 |
| 5 | 424 |
| 6 | 1799 |
| 7 | 7702 |
| 8 | 33516 |
| 9 | 147394 |
| 10 | 652986 |
| 11 | 2914743 |
| 12 | 13083333 |
| 13 | 58999874 |
| 14 | 267246535 |
| 15 | 1214730328 |
| 16 | 5539131519 |
| 17 | 25330977489 |
| 18 | 116127158302 |
| 19 | 533596390917 |
| 20 | 2456884051208 |
| 21 | 11333435962029 |
| 22 | 52370456329081 |
| 23 | 242376654647296 |
| 24 | 1123371423517327 |
| 25 | 5213627047990241 |
| 26 | 24226805860447941 |
| 27 | 112708523641261090 |
[1,2,7,26,104,424,1799,7702,33516,147394,652986, 2914743,13083333,58999874,267246535,1214730328, 5539131519,25330977489,116127158302,533596390917, 2456884051208,11333435962029,52370456329081, 242376654647296,1123371423517327,5213627047990241, 24226805860447941,112708523641261090] |