The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 10 |
| 4 | 21 |
| 5 | 40 |
| 6 | 70 |
| 7 | 125 |
| 8 | 231 |
| 9 | 419 |
| 10 | 752 |
| 11 | 1365 |
| 12 | 2482 |
| 13 | 4488 |
| 14 | 8121 |
| 15 | 14729 |
| 16 | 26689 |
| 17 | 48322 |
| 18 | 87545 |
| 19 | 158636 |
| 20 | 287360 |
| 21 | 520537 |
| 22 | 943067 |
| 23 | 1708503 |
| 24 | 3095024 |
| 25 | 5606953 |
| 26 | 10157742 |
| 27 | 18401740 |
| 28 | 33336465 |
| 29 | 60392685 |
| 30 | 109407857 |
| 31 | 198203346 |
| 32 | 359065917 |
| 33 | 650486008 |
[3,7,10,21,40,70,125,231,419,752,1365,2482,4488, 8121,14729,26689,48322,87545,158636,287360,520537, 943067,1708503,3095024,5606953,10157742,18401740, 33336465,60392685,109407857,198203346,359065917, 650486008] |