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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 23 |
| 4 | 92 |
| 5 | 382 |
| 6 | 1617 |
| 7 | 7041 |
| 8 | 31302 |
| 9 | 140875 |
| 10 | 639710 |
| 11 | 2928650 |
| 12 | 13519106 |
| 13 | 62819420 |
| 14 | 293392731 |
| 15 | 1376112419 |
| 16 | 6480610420 |
| 17 | 30633985898 |
| 18 | 145272764685 |
| 19 | 690803770276 |
| 20 | 3293055006096 |
| 21 | 15734382993826 |
| 22 | 75339425088519 |
| 23 | 361425733685793 |
| 24 | 1736837802687885 |
| 25 | 8359655566673245 |
| 26 | 40295920176607576 |
| 27 | 194503978049443503 |
[1,2,6,23,92,382,1617,7041,31302,140875,639710, 2928650,13519106,62819420,293392731,1376112419, 6480610420,30633985898,145272764685,690803770276, 3293055006096,15734382993826,75339425088519, 361425733685793,1736837802687885,8359655566673245, 40295920176607576,194503978049443503] |