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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 42 |
| 4 | 221 |
| 5 | 1379 |
| 6 | 9678 |
| 7 | 73666 |
| 8 | 594326 |
| 9 | 5007958 |
| 10 | 43641702 |
| 11 | 390632678 |
| 12 | 3573598539 |
| 13 | 33289289533 |
| 14 | 314871186248 |
| 15 | 3017358158132 |
| 16 | 29242725947318 |
| 17 | 286209134234602 |
| 18 | 2825613061237808 |
| 19 | 28111283170770480 |
| 20 | 281598654896870051 |
| 21 | 2838309465080014489 |
| 22 | 28767973963085929656 |
| 23 | 293059625830028920012 |
[1,3,10,42,221,1379,9678,73666,594326,5007958, 43641702,390632678,3573598539,33289289533, 314871186248,3017358158132,29242725947318, 286209134234602,2825613061237808, 28111283170770480,281598654896870051, 2838309465080014489,28767973963085929656, 293059625830028920012] |