The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 4 |
| 7 | 9 |
| 8 | 14 |
| 9 | 19 |
| 10 | 43 |
| 11 | 67 |
| 12 | 91 |
| 13 | 206 |
| 14 | 321 |
| 15 | 436 |
| 16 | 987 |
| 17 | 1538 |
| 18 | 2089 |
| 19 | 4729 |
| 20 | 7369 |
| 21 | 10009 |
| 22 | 22658 |
| 23 | 35307 |
| 24 | 47956 |
| 25 | 108561 |
| 26 | 169166 |
| 27 | 229771 |
| 28 | 520147 |
| 29 | 810523 |
| 30 | 1100899 |
| 31 | 2492174 |
| 32 | 3883449 |
| 33 | 5274724 |
| 34 | 11940723 |
| 35 | 18606722 |
| 36 | 25272721 |
| 37 | 57211441 |
| 38 | 89150161 |
| 39 | 121088881 |
[1,1,1,1,2,3,4,9,14,19,43,67,91,206,321,436,987, 1538,2089,4729,7369,10009,22658,35307,47956, 108561,169166,229771,520147,810523,1100899, 2492174,3883449,5274724,11940723,18606722, 25272721,57211441,89150161,121088881] |