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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 13 |
| 3 | 31 |
| 4 | 68 |
| 5 | 134 |
| 6 | 250 |
| 7 | 447 |
| 8 | 777 |
| 9 | 1323 |
| 10 | 2220 |
| 11 | 3697 |
| 12 | 6097 |
| 13 | 10002 |
| 14 | 16337 |
| 15 | 26609 |
| 16 | 43250 |
| 17 | 70199 |
| 18 | 113827 |
| 19 | 184444 |
| 20 | 298731 |
| 21 | 483679 |
| 22 | 782960 |
| 23 | 1267237 |
| 24 | 2050845 |
| 25 | 3318782 |
| 26 | 5370381 |
| 27 | 8689973 |
| 28 | 14061250 |
| 29 | 22752180 |
| 30 | 36814450 |
| 31 | 59567715 |
| 32 | 96383317 |
| 33 | 155952253 |
| 34 | 252336862 |
[2,3,13,31,68,134,250,447,777,1323,2220,3697,6097, 10002,16337,26609,43250,70199,113827,184444, 298731,483679,782960,1267237,2050845,3318782, 5370381,8689973,14061250,22752180,36814450, 59567715,96383317,155952253,252336862] |