The OEIS is supported by the many generous donors to the OEIS Foundation.
A218671 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 120 |
| 4 | 2635 |
| 5 | 76503 |
| 6 | 2764957 |
| 7 | 119634152 |
| 8 | 6030195490 |
| 9 | 347037131298 |
| 10 | 22453144758980 |
| 11 | 1613322276606404 |
| 12 | 127466755375275614 |
| 13 | 10983423290600347408 |
| 14 | 1025046637630590359928 |
| 15 | 103004615955568528609200 |
| 16 | 11088429267977228122393005 |
| 17 | 1273093489376335864500416685 |
[1,1,8,120,2635,76503,2764957,119634152, 6030195490,347037131298,22453144758980, 1613322276606404,127466755375275614, 10983423290600347408,1025046637630590359928, 103004615955568528609200, 11088429267977228122393005, 1273093489376335864500416685] |