The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 3 |
| 6 | 11 |
| 7 | 32 |
| 8 | 100 |
| 9 | 294 |
| 10 | 881 |
| 11 | 2590 |
| 12 | 7639 |
| 13 | 22344 |
| 14 | 65278 |
| 15 | 189832 |
| 16 | 550846 |
| 17 | 1593558 |
| 18 | 4600435 |
| 19 | 13251623 |
| 20 | 38104280 |
| 21 | 109382300 |
| 22 | 313543725 |
| 23 | 897588156 |
| 24 | 2566575323 |
| 25 | 7331196543 |
| 26 | 20921299025 |
| 27 | 59653124923 |
| 28 | 169959192844 |
| 29 | 483897197563 |
| 30 | 1376848221698 |
| 31 | 3915320424705 |
| 32 | 11128029239672 |
[1,3,11,32,100,294,881,2590,7639,22344,65278, 189832,550846,1593558,4600435,13251623,38104280, 109382300,313543725,897588156,2566575323, 7331196543,20921299025,59653124923,169959192844, 483897197563,1376848221698,3915320424705, 11128029239672] |