The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 12 |
| 5 | 29 |
| 6 | 66 |
| 7 | 137 |
| 8 | 279 |
| 9 | 546 |
| 10 | 1057 |
| 11 | 2000 |
| 12 | 3746 |
| 13 | 6886 |
| 14 | 12508 |
| 15 | 22360 |
| 16 | 39477 |
| 17 | 68736 |
| 18 | 118309 |
| 19 | 201207 |
| 20 | 338672 |
| 21 | 564211 |
| 22 | 931342 |
| 23 | 1523628 |
| 24 | 2472228 |
| 25 | 3979651 |
| 26 | 6359094 |
| 27 | 10088975 |
| 28 | 15899507 |
| 29 | 24894711 |
| 30 | 38740189 |
| 31 | 59929503 |
| 32 | 92185390 |
| 33 | 141029958 |
| 34 | 214628608 |
[0,1,4,12,29,66,137,279,546,1057,2000,3746,6886, 12508,22360,39477,68736,118309,201207,338672, 564211,931342,1523628,2472228,3979651,6359094, 10088975,15899507,24894711,38740189,59929503, 92185390,141029958,214628608] |