The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 8 |
| 7 | 8 |
| 8 | 13 |
| 9 | 21 |
| 10 | 77 |
| 11 | 77 |
| 12 | 128 |
| 13 | 128 |
| 14 | 354 |
| 15 | 641 |
| 16 | 1232 |
| 17 | 1232 |
| 18 | 2677 |
| 19 | 2677 |
| 20 | 7220 |
| 21 | 8951 |
| 22 | 25378 |
| 23 | 25378 |
| 24 | 63680 |
| 25 | 113335 |
| 26 | 323151 |
| 27 | 532358 |
| 28 | 1442702 |
| 29 | 1442702 |
| 30 | 2963955 |
| 31 | 2963955 |
| 32 | 5307221 |
| 33 | 6739508 |
| 34 | 21786788 |
| 35 | 41416560 |
| 36 | 83691901 |
| 37 | 83691901 |
| 38 | 242224403 |
| 39 | 373640477 |
| 40 | 669300795 |
| 41 | 669300795 |
[1,1,1,2,2,8,8,13,21,77,77,128,128,354,641,1232, 1232,2677,2677,7220,8951,25378,25378,63680,113335, 323151,532358,1442702,1442702,2963955,2963955, 5307221,6739508,21786788,41416560,83691901, 83691901,242224403,373640477,669300795,669300795] |