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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 1 |
| 4 | 4 |
| 5 | 6 |
| 6 | 14 |
| 7 | 26 |
| 8 | 54 |
| 9 | 105 |
| 10 | 213 |
| 11 | 424 |
| 12 | 850 |
| 13 | 1697 |
| 14 | 3392 |
| 15 | 6776 |
| 16 | 13540 |
| 17 | 27052 |
| 18 | 54157 |
| 19 | 108312 |
| 20 | 216626 |
| 21 | 433249 |
| 22 | 866496 |
| 23 | 1732984 |
| 24 | 3465956 |
| 25 | 6931884 |
| 26 | 13863717 |
| 27 | 27727326 |
| 28 | 55454441 |
| 29 | 110908456 |
| 30 | 221816065 |
| 31 | 443630435 |
| 32 | 887257486 |
| 33 | 1774508208 |
[1,3,1,4,6,14,26,54,105,213,424,850,1697,3392, 6776,13540,27052,54157,108312,216626,433249, 866496,1732984,3465956,6931884,13863717,27727326, 55454441,110908456,221816065,443630435,887257486, 1774508208] |