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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 16 |
| 4 | 61 |
| 5 | 130 |
| 6 | 429 |
| 7 | 945 |
| 8 | 2684 |
| 9 | 5990 |
| 10 | 15530 |
| 11 | 34313 |
| 12 | 83995 |
| 13 | 183070 |
| 14 | 427046 |
| 15 | 919480 |
| 16 | 2067589 |
| 17 | 4384678 |
| 18 | 9577536 |
| 19 | 20019243 |
| 20 | 42664087 |
| 21 | 87954522 |
| 22 | 183573639 |
| 23 | 373430131 |
| 24 | 765524808 |
| 25 | 1537737243 |
| 26 | 3102614407 |
| 27 | 6159028445 |
| 28 | 12252086879 |
| 29 | 24051526041 |
| 30 | 47239506797 |
| 31 | 91765428710 |
| 32 | 178156003047 |
[1,1,7,16,61,130,429,945,2684,5990,15530,34313, 83995,183070,427046,919480,2067589,4384678, 9577536,20019243,42664087,87954522,183573639, 373430131,765524808,1537737243,3102614407, 6159028445,12252086879,24051526041,47239506797, 91765428710,178156003047] |