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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 29 |
| 6 | 88 |
| 7 | 263 |
| 8 | 849 |
| 9 | 2723 |
| 10 | 9157 |
| 11 | 30722 |
| 12 | 106294 |
| 13 | 367742 |
| 14 | 1299180 |
| 15 | 4595014 |
| 16 | 16493712 |
| 17 | 59306116 |
| 18 | 215549417 |
| 19 | 784975686 |
| 20 | 2881728074 |
| 21 | 10600876580 |
| 22 | 39237430745 |
| 23 | 145524254095 |
| 24 | 542325039961 |
| 25 | 2024973907989 |
| 26 | 7590098952820 |
| 27 | 28500892031086 |
| 28 | 107355932684246 |
| 29 | 405060263789931 |
| 30 | 1532269008006369 |
[1,1,2,4,11,29,88,263,849,2723,9157,30722,106294, 367742,1299180,4595014,16493712,59306116, 215549417,784975686,2881728074,10600876580, 39237430745,145524254095,542325039961, 2024973907989,7590098952820,28500892031086, 107355932684246,405060263789931,1532269008006369] |