The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 127 |
| 5 | 1363 |
| 6 | 18628 |
| 7 | 311250 |
| 8 | 6173791 |
| 9 | 142190703 |
| 10 | 3737431895 |
| 11 | 110577492346 |
| 12 | 3641313700916 |
| 13 | 132214630355700 |
| 14 | 5251687490704524 |
| 15 | 226664506308709858 |
| 16 | 10568175957745041423 |
| 17 | 529589006347242691143 |
| 18 | 28395998790096299447521 |
[1,3,16,127,1363,18628,311250,6173791,142190703, 3737431895,110577492346,3641313700916, 132214630355700,5251687490704524, 226664506308709858,10568175957745041423, 529589006347242691143,28395998790096299447521] |