The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 9 | 2621 |
| 10 | 9459 |
| 11 | 26167 |
| 12 | 69404 |
| 13 | 188735 |
| 14 | 558151 |
| 15 | 1745634 |
| 16 | 5935728 |
| 17 | 20786804 |
| 18 | 77416352 |
| 19 | 219059475 |
| 20 | 578513498 |
| 21 | 1500419043 |
| 22 | 3908857765 |
| 23 | 10470345790 |
| 24 | 28385741484 |
| 25 | 79729201108 |
| 26 | 221303407539 |
| 27 | 630847591899 |
| 28 | 1653827513009 |
| 29 | 4173815556603 |
| 30 | 10415200154855 |
| 31 | 25901062216475 |
[2621,9459,26167,69404,188735,558151,1745634, 5935728,20786804,77416352,219059475,578513498, 1500419043,3908857765,10470345790,28385741484, 79729201108,221303407539,630847591899, 1653827513009,4173815556603,10415200154855, 25901062216475] |