The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 169 |
| 3 | 360 |
| 4 | 1042 |
| 5 | 2638 |
| 6 | 5334 |
| 7 | 11465 |
| 8 | 23663 |
| 9 | 47894 |
| 10 | 96640 |
| 11 | 191362 |
| 12 | 379376 |
| 13 | 747730 |
| 14 | 1463055 |
| 15 | 2862068 |
| 16 | 5581156 |
| 17 | 10849490 |
| 18 | 21083501 |
| 19 | 40888242 |
| 20 | 79201233 |
| 21 | 153391120 |
| 22 | 296676820 |
| 23 | 573780370 |
| 24 | 1109365604 |
| 25 | 2143845429 |
| 26 | 4144119537 |
| 27 | 8008600858 |
[13,169,360,1042,2638,5334,11465,23663,47894, 96640,191362,379376,747730,1463055,2862068, 5581156,10849490,21083501,40888242,79201233, 153391120,296676820,573780370,1109365604, 2143845429,4144119537,8008600858] |