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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 35 |
| 4 | 157 |
| 5 | 712 |
| 6 | 3248 |
| 7 | 14869 |
| 8 | 68222 |
| 9 | 313487 |
| 10 | 1441999 |
| 11 | 6637879 |
| 12 | 30572032 |
| 13 | 140860379 |
| 14 | 649202036 |
| 15 | 2992721902 |
| 16 | 13798302512 |
| 17 | 63626933527 |
| 18 | 293426802548 |
| 19 | 1353295096618 |
| 20 | 6241829542241 |
| 21 | 28790709824587 |
| 22 | 132803515725281 |
| 23 | 612604408102432 |
| 24 | 2825929675569155 |
[1,2,8,35,157,712,3248,14869,68222,313487,1441999, 6637879,30572032,140860379,649202036,2992721902, 13798302512,63626933527,293426802548, 1353295096618,6241829542241,28790709824587, 132803515725281,612604408102432,2825929675569155] |