The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 62 |
| 5 | 395 |
| 6 | 2994 |
| 7 | 26331 |
| 8 | 263729 |
| 9 | 2964845 |
| 10 | 36975858 |
| 11 | 506687604 |
| 12 | 7568226163 |
| 13 | 122388728056 |
| 14 | 2130425343621 |
| 15 | 39718373337525 |
| 16 | 789613850257051 |
| 17 | 16674806980716514 |
| 18 | 372771700023167862 |
| 19 | 8794945626017009781 |
| 20 | 218392778569695964100 |
| 21 | 5693513850197410142081 |
| 22 | 155482323312112362743373 |
| 23 | 4438621019461797437443233 |
| 24 | 132210153223378852014571364 |
| 25 | 4101859859297789141335079684 |
| 26 | 132343983668857026899533814277 |
[1,1,3,12,62,395,2994,26331,263729,2964845, 36975858,506687604,7568226163,122388728056, 2130425343621,39718373337525,789613850257051, 16674806980716514,372771700023167862, 8794945626017009781,218392778569695964100, 5693513850197410142081,155482323312112362743373, 4438621019461797437443233, 132210153223378852014571364, 4101859859297789141335079684, 132343983668857026899533814277] |