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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 12 |
| 5 | 31 |
| 6 | 71 |
| 7 | 128 |
| 8 | 230 |
| 9 | 555 |
| 10 | 1437 |
| 11 | 2248 |
| 12 | 4646 |
| 13 | 8137 |
| 14 | 18279 |
| 15 | 49590 |
| 16 | 76264 |
| 17 | 144351 |
| 18 | 264615 |
| 19 | 474526 |
| 20 | 953766 |
| 21 | 2712603 |
| 22 | 3931785 |
| 23 | 7491022 |
| 24 | 12745506 |
| 25 | 23133569 |
| 26 | 38434487 |
| 27 | 76679812 |
| 28 | 208933080 |
| 29 | 301358215 |
| 30 | 553702323 |
[1,1,3,8,12,31,71,128,230,555,1437,2248,4646,8137, 18279,49590,76264,144351,264615,474526,953766, 2712603,3931785,7491022,12745506,23133569, 38434487,76679812,208933080,301358215,553702323] |