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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 29 |
| 5 | 92 |
| 6 | 310 |
| 7 | 1088 |
| 8 | 3931 |
| 9 | 14518 |
| 10 | 54551 |
| 11 | 207856 |
| 12 | 801202 |
| 13 | 3118532 |
| 14 | 12239732 |
| 15 | 48385852 |
| 16 | 192483953 |
| 17 | 769974110 |
| 18 | 3095236066 |
| 19 | 12497442266 |
| 20 | 50660112478 |
| 21 | 206093561590 |
| 22 | 841151382755 |
| 23 | 3443278744832 |
| 24 | 14133534466258 |
[1,2,4,10,29,92,310,1088,3931,14518,54551,207856, 801202,3118532,12239732,48385852,192483953, 769974110,3095236066,12497442266,50660112478, 206093561590,841151382755,3443278744832, 14133534466258] |