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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 11 |
| 3 | 30 |
| 4 | 78 |
| 5 | 137 |
| 6 | 327 |
| 7 | 499 |
| 8 | 1124 |
| 9 | 1640 |
| 10 | 3559 |
| 11 | 5194 |
| 12 | 10994 |
| 13 | 16499 |
| 14 | 34311 |
| 15 | 53893 |
| 16 | 110632 |
| 17 | 183330 |
| 18 | 372823 |
| 19 | 650828 |
| 20 | 1314966 |
| 21 | 2398341 |
| 22 | 4825319 |
| 23 | 9095375 |
| 24 | 18252108 |
| 25 | 35193132 |
| 26 | 70517191 |
| 27 | 137978270 |
| 28 | 276234842 |
| 29 | 545423911 |
| 30 | 1091437319 |
| 31 | 2166784713 |
| 32 | 4334814160 |
| 33 | 8633189254 |
| 34 | 17268999351 |
[1,4,11,30,78,137,327,499,1124,1640,3559,5194, 10994,16499,34311,53893,110632,183330,372823, 650828,1314966,2398341,4825319,9095375,18252108, 35193132,70517191,137978270,276234842,545423911, 1091437319,2166784713,4334814160,8633189254, 17268999351] |