The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 18 |
| 3 | 274 |
| 4 | 5938 |
| 5 | 167122 |
| 6 | 5786418 |
| 7 | 237857874 |
| 8 | 11319677618 |
| 9 | 612109819602 |
| 10 | 37069480301618 |
| 11 | 2485356833141074 |
| 12 | 182753029186750898 |
| 13 | 14623552941626800082 |
| 14 | 1265002802597606144818 |
| 15 | 117633823750542653153874 |
| 16 | 11701922865351577653913778 |
[1,2,18,274,5938,167122,5786418,237857874, 11319677618,612109819602,37069480301618, 2485356833141074,182753029186750898, 14623552941626800082,1265002802597606144818, 117633823750542653153874, 11701922865351577653913778] |