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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 36 |
| 6 | 104 |
| 7 | 310 |
| 8 | 943 |
| 9 | 2913 |
| 10 | 9112 |
| 11 | 28805 |
| 12 | 91893 |
| 13 | 295484 |
| 14 | 956671 |
| 15 | 3115805 |
| 16 | 10200445 |
| 17 | 33544983 |
| 18 | 110755143 |
| 19 | 366976365 |
| 20 | 1219814018 |
| 21 | 4066305982 |
| 22 | 13590864072 |
| 23 | 45534416250 |
| 24 | 152895704998 |
| 25 | 514446539489 |
| 26 | 1734239511881 |
[1,1,2,5,13,36,104,310,943,2913,9112,28805,91893, 295484,956671,3115805,10200445,33544983,110755143, 366976365,1219814018,4066305982,13590864072, 45534416250,152895704998,514446539489, 1734239511881] |