| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 32 |
| 5 | 107 |
| 6 | 359 |
| 7 | 1234 |
| 8 | 4274 |
| 9 | 15032 |
| 10 | 53242 |
| 11 | 190588 |
| 12 | 686272 |
| 13 | 2490399 |
| 14 | 9081375 |
| 15 | 33312770 |
| 16 | 122692130 |
| 17 | 453999656 |
| 18 | 1685601038 |
| 19 | 6282014804 |
| 20 | 23478897364 |
| 21 | 88026769844 |
| 22 | 330831420218 |
| 23 | 1246635155180 |
| 24 | 4707414286652 |
| 25 | 17815452662152 |
| 26 | 67546709440004 |
| 27 | 256595322436760 |
[1,3,10,32,107,359,1234,4274,15032,53242,190588, 686272,2490399,9081375,33312770,122692130, 453999656,1685601038,6282014804,23478897364, 88026769844,330831420218,1246635155180, 4707414286652,17815452662152,67546709440004, 256595322436760] |