The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 37 |
| 5 | 99 |
| 6 | 265 |
| 7 | 701 |
| 8 | 1849 |
| 9 | 4861 |
| 10 | 12761 |
| 11 | 33463 |
| 12 | 87697 |
| 13 | 229737 |
| 14 | 601693 |
| 15 | 1575629 |
| 16 | 4125661 |
| 17 | 10802107 |
| 18 | 28281881 |
| 19 | 74045509 |
| 20 | 193857841 |
| 21 | 507533181 |
| 22 | 1328750065 |
| 23 | 3478730543 |
| 24 | 9107463457 |
| 25 | 23843695249 |
| 26 | 62423679605 |
| 27 | 163427436301 |
| 28 | 427858779349 |
| 29 | 1120149144531 |
[1,5,13,37,99,265,701,1849,4861,12761,33463,87697, 229737,601693,1575629,4125661,10802107,28281881, 74045509,193857841,507533181,1328750065, 3478730543,9107463457,23843695249,62423679605, 163427436301,427858779349,1120149144531] |