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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 28 |
| 4 | 118 |
| 5 | 517 |
| 6 | 2338 |
| 7 | 10779 |
| 8 | 50392 |
| 9 | 238290 |
| 10 | 1136736 |
| 11 | 5459706 |
| 12 | 26368937 |
| 13 | 127941671 |
| 14 | 623126153 |
| 15 | 3044479214 |
| 16 | 14914765582 |
| 17 | 73234215657 |
| 18 | 360298749816 |
| 19 | 1775608806543 |
| 20 | 8763377993794 |
| 21 | 43306592738488 |
| 22 | 214252633433016 |
| 23 | 1061035556287348 |
| 24 | 5259149506966365 |
| 25 | 26087955095040543 |
| 26 | 129499032540293441 |
[1,2,7,28,118,517,2338,10779,50392,238290,1136736, 5459706,26368937,127941671,623126153,3044479214, 14914765582,73234215657,360298749816, 1775608806543,8763377993794,43306592738488, 214252633433016,1061035556287348,5259149506966365, 26087955095040543,129499032540293441] |