The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 10 |
| 7 | 17 |
| 8 | 31 |
| 9 | 57 |
| 10 | 104 |
| 11 | 188 |
| 12 | 340 |
| 13 | 616 |
| 14 | 1117 |
| 15 | 2025 |
| 16 | 3670 |
| 17 | 6651 |
| 18 | 12054 |
| 19 | 21847 |
| 20 | 39596 |
| 21 | 71764 |
| 22 | 130065 |
| 23 | 235730 |
| 24 | 427238 |
| 25 | 774328 |
| 26 | 1403395 |
| 27 | 2543518 |
| 28 | 4609881 |
| 29 | 8354965 |
| 30 | 15142569 |
| 31 | 27444447 |
| 32 | 49740415 |
| 33 | 90149708 |
| 34 | 163387657 |
| 35 | 296124381 |
| 36 | 536696900 |
[1,1,1,3,6,10,17,31,57,104,188,340,616,1117,2025, 3670,6651,12054,21847,39596,71764,130065,235730, 427238,774328,1403395,2543518,4609881,8354965, 15142569,27444447,49740415,90149708,163387657, 296124381,536696900] |