The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 17 |
| 3 | 48 |
| 4 | 146 |
| 5 | 424 |
| 6 | 1274 |
| 7 | 3820 |
| 8 | 11529 |
| 9 | 34783 |
| 10 | 104826 |
| 11 | 315711 |
| 12 | 950990 |
| 13 | 2864947 |
| 14 | 8631274 |
| 15 | 26003209 |
| 16 | 78338270 |
| 17 | 236004118 |
| 18 | 710993764 |
| 19 | 2141965614 |
| 20 | 6452965003 |
| 21 | 19440438745 |
| 22 | 58566971613 |
| 23 | 176440981687 |
| 24 | 531552505076 |
| 25 | 1601374384608 |
[1,17,48,146,424,1274,3820,11529,34783,104826, 315711,950990,2864947,8631274,26003209,78338270, 236004118,710993764,2141965614,6452965003, 19440438745,58566971613,176440981687,531552505076, 1601374384608] |