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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 17 |
| 3 | 45 |
| 4 | 118 |
| 5 | 309 |
| 6 | 809 |
| 7 | 2118 |
| 8 | 5545 |
| 9 | 14517 |
| 10 | 38006 |
| 11 | 99501 |
| 12 | 260497 |
| 13 | 681990 |
| 14 | 1785473 |
| 15 | 4674429 |
| 16 | 12237814 |
| 17 | 32039013 |
| 18 | 83879225 |
| 19 | 219598662 |
| 20 | 574916761 |
| 21 | 1505151621 |
| 22 | 3940538102 |
| 23 | 10316462685 |
| 24 | 27008849953 |
| 25 | 70710087174 |
| 26 | 185121411569 |
| 27 | 484654147533 |
| 28 | 1268841031030 |
[1,6,17,45,118,309,809,2118,5545,14517,38006, 99501,260497,681990,1785473,4674429,12237814, 32039013,83879225,219598662,574916761,1505151621, 3940538102,10316462685,27008849953,70710087174, 185121411569,484654147533,1268841031030] |