The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 39 |
| 3 | 495 |
| 4 | 7235 |
| 5 | 115303 |
| 6 | 1948791 |
| 7 | 34379505 |
| 8 | 626684162 |
| 9 | 11722058693 |
| 10 | 223870302588 |
| 11 | 4349161774626 |
| 12 | 85701267415112 |
| 13 | 1709101664822416 |
| 14 | 34432888701965454 |
| 15 | 699810795294490974 |
| 16 | 14331183304458656628 |
| 17 | 295434131968070459359 |
| 18 | 6125911207605272841753 |
| 19 | 127680054133385458855845 |
[4,39,495,7235,115303,1948791,34379505,626684162, 11722058693,223870302588,4349161774626, 85701267415112,1709101664822416,34432888701965454, 699810795294490974,14331183304458656628, 295434131968070459359,6125911207605272841753, 127680054133385458855845] |