The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 21 |
| 4 | 57 |
| 5 | 133 |
| 6 | 280 |
| 7 | 547 |
| 8 | 1010 |
| 9 | 1785 |
| 10 | 3047 |
| 11 | 5058 |
| 12 | 8208 |
| 13 | 13075 |
| 14 | 20513 |
| 15 | 31781 |
| 16 | 48732 |
| 17 | 74090 |
| 18 | 111856 |
| 19 | 167903 |
| 20 | 250848 |
| 21 | 373330 |
| 22 | 553883 |
| 23 | 819681 |
| 24 | 1210561 |
| 25 | 1784919 |
| 26 | 2628351 |
| 27 | 3866317 |
| 28 | 5682701 |
| 29 | 8347012 |
| 30 | 12254249 |
| 31 | 17983326 |
| 32 | 26382698 |
| 33 | 38695852 |
| 34 | 56745223 |
| 35 | 83201736 |
[0,1,6,21,57,133,280,547,1010,1785,3047,5058,8208, 13075,20513,31781,48732,74090,111856,167903, 250848,373330,553883,819681,1210561,1784919, 2628351,3866317,5682701,8347012,12254249,17983326, 26382698,38695852,56745223,83201736] |