The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 27 |
| 5 | 57 |
| 6 | 117 |
| 7 | 242 |
| 8 | 493 |
| 9 | 994 |
| 10 | 2001 |
| 11 | 4038 |
| 12 | 8113 |
| 13 | 16274 |
| 14 | 32589 |
| 15 | 65330 |
| 16 | 130765 |
| 17 | 261682 |
| 18 | 523533 |
| 19 | 1047666 |
| 20 | 2095885 |
| 21 | 4192562 |
| 22 | 8385741 |
| 23 | 16773426 |
| 24 | 33549517 |
| 25 | 67102002 |
| 26 | 134205645 |
| 27 | 268420914 |
| 28 | 536851469 |
| 29 | 1073713650 |
| 30 | 2147438093 |
| 31 | 4294914546 |
| 32 | 8589853325 |
[1,2,5,12,27,57,117,242,493,994,2001,4038,8113, 16274,32589,65330,130765,261682,523533,1047666, 2095885,4192562,8385741,16773426,33549517, 67102002,134205645,268420914,536851469,1073713650, 2147438093,4294914546,8589853325] |