The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 173 |
| 3 | 1604 |
| 4 | 13833 |
| 5 | 115032 |
| 6 | 938821 |
| 7 | 7588108 |
| 8 | 61024865 |
| 9 | 489508448 |
| 10 | 3921394269 |
| 11 | 31392726612 |
| 12 | 251228899897 |
| 13 | 2010181938664 |
| 14 | 16082865641717 |
| 15 | 128668587186716 |
| 16 | 1029371410275729 |
| 17 | 8235062327044080 |
| 18 | 65880863376836365 |
[1,16,173,1604,13833,115032,938821,7588108, 61024865,489508448,3921394269,31392726612, 251228899897,2010181938664,16082865641717, 128668587186716,1029371410275729,8235062327044080, 65880863376836365] |