The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 16 |
| 6 | 34 |
| 7 | 70 |
| 8 | 145 |
| 9 | 292 |
| 10 | 598 |
| 11 | 1198 |
| 12 | 2428 |
| 13 | 4858 |
| 14 | 9784 |
| 15 | 19570 |
| 16 | 39283 |
| 17 | 78568 |
| 18 | 157426 |
| 19 | 314854 |
| 20 | 630304 |
| 21 | 1260610 |
| 22 | 2522416 |
| 23 | 5044834 |
| 24 | 10092094 |
| 25 | 20184190 |
| 26 | 40373236 |
| 27 | 80746474 |
| 28 | 161502730 |
| 29 | 323005462 |
| 30 | 646030492 |
| 31 | 1292060986 |
| 32 | 2584161253 |
| 33 | 5168322508 |
| 34 | 10336723582 |
[1,1,1,4,7,16,34,70,145,292,598,1198,2428,4858, 9784,19570,39283,78568,157426,314854,630304, 1260610,2522416,5044834,10092094,20184190, 40373236,80746474,161502730,323005462,646030492, 1292060986,2584161253,5168322508,10336723582] |