| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 14 |
| 5 | 31 |
| 6 | 73 |
| 7 | 172 |
| 8 | 400 |
| 9 | 932 |
| 10 | 2177 |
| 11 | 5081 |
| 12 | 11854 |
| 13 | 27662 |
| 14 | 64554 |
| 15 | 150639 |
| 16 | 351521 |
| 17 | 820296 |
| 18 | 1914208 |
| 19 | 4466904 |
| 20 | 10423761 |
| 21 | 24324417 |
| 22 | 56762346 |
| 23 | 132458006 |
| 24 | 309097942 |
| 25 | 721296815 |
| 26 | 1683185225 |
| 27 | 3927803988 |
| 28 | 9165743600 |
| 29 | 21388759708 |
| 30 | 49911830577 |
| 31 | 116471963129 |
[1,1,2,6,14,31,73,172,400,932,2177,5081,11854, 27662,64554,150639,351521,820296,1914208,4466904, 10423761,24324417,56762346,132458006,309097942, 721296815,1683185225,3927803988,9165743600, 21388759708,49911830577,116471963129] |