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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 31 |
| 5 | 100 |
| 6 | 421 |
| 7 | 1552 |
| 8 | 6762 |
| 9 | 26907 |
| 10 | 120089 |
| 11 | 500608 |
| 12 | 2276471 |
| 13 | 9796176 |
| 14 | 45167827 |
| 15 | 198958096 |
| 16 | 926982691 |
| 17 | 4156792143 |
| 18 | 19525807142 |
| 19 | 88793214818 |
| 20 | 419830105812 |
| 21 | 1930734137846 |
| 22 | 9178004031467 |
| 23 | 42597152333828 |
| 24 | 203400088951928 |
| 25 | 951233632472524 |
| 26 | 4559345764647379 |
| 27 | 21459263407915619 |
| 28 | 103190090318432504 |
[1,1,3,8,31,100,421,1552,6762,26907,120089,500608, 2276471,9796176,45167827,198958096,926982691, 4156792143,19525807142,88793214818,419830105812, 1930734137846,9178004031467,42597152333828, 203400088951928,951233632472524,4559345764647379, 21459263407915619,103190090318432504] |