The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 10 |
| 3 | 25 |
| 4 | 43 |
| 5 | 124 |
| 6 | 214 |
| 7 | 493 |
| 8 | 979 |
| 9 | 2032 |
| 10 | 3706 |
| 11 | 8377 |
| 12 | 14695 |
| 13 | 30004 |
| 14 | 58030 |
| 15 | 113029 |
| 16 | 204883 |
| 17 | 424312 |
| 18 | 754306 |
| 19 | 1467025 |
| 20 | 2783599 |
| 21 | 5248348 |
| 22 | 9524662 |
| 23 | 18925117 |
| 24 | 33713611 |
[1,4,10,25,43,124,214,493,979,2032,3706,8377, 14695,30004,58030,113029,204883,424312,754306, 1467025,2783599,5248348,9524662,18925117,33713611] |