The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 104 |
| 5 | 1409 |
| 6 | 24912 |
| 7 | 543479 |
| 8 | 14098112 |
| 9 | 423643509 |
| 10 | 14464318560 |
| 11 | 552830505347 |
| 12 | 23375870438400 |
| 13 | 1083128382648857 |
| 14 | 54563592529048064 |
| 15 | 2968656741661668975 |
| 16 | 173460812744585863168 |
| 17 | 10832194187368473624893 |
[1,2,11,104,1409,24912,543479,14098112,423643509, 14464318560,552830505347,23375870438400, 1083128382648857,54563592529048064, 2968656741661668975,173460812744585863168, 10832194187368473624893] |