The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 60 |
| 2 | 140 |
| 3 | 297 |
| 4 | 711 |
| 5 | 1543 |
| 6 | 3461 |
| 7 | 7637 |
| 8 | 16689 |
| 9 | 35609 |
| 10 | 78429 |
| 11 | 165847 |
| 12 | 353699 |
| 13 | 759497 |
| 14 | 1602963 |
| 15 | 3361709 |
| 16 | 7188651 |
| 17 | 14983771 |
| 18 | 31325141 |
| 19 | 66287453 |
| 20 | 137719185 |
| 21 | 285727121 |
| 22 | 602441997 |
| 23 | 1243951375 |
| 24 | 2572947779 |
| 25 | 5396750465 |
| 26 | 11110939203 |
| 27 | 22884164645 |
[60,140,297,711,1543,3461,7637,16689,35609,78429, 165847,353699,759497,1602963,3361709,7188651, 14983771,31325141,66287453,137719185,285727121, 602441997,1243951375,2572947779,5396750465, 11110939203,22884164645] |