The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 34 |
| 6 | 70 |
| 7 | 853 |
| 8 | 2365 |
| 9 | 36369 |
| 10 | 125870 |
| 11 | 2367212 |
| 12 | 9829820 |
| 13 | 218570717 |
| 14 | 1058927507 |
| 15 | 27167018427 |
| 16 | 150421002736 |
| 17 | 4373595961678 |
| 18 | 27243141998506 |
| 19 | 885304614118777 |
| 20 | 6127294825424317 |
| 21 | 220074660203753961 |
| 22 | 1675478215412320154 |
| 23 | 65909583942401516528 |
| 24 | 547401364007816870552 |
| 25 | 23406034074310130665241 |
[0,1,1,3,4,34,70,853,2365,36369,125870,2367212, 9829820,218570717,1058927507,27167018427, 150421002736,4373595961678,27243141998506, 885304614118777,6127294825424317, 220074660203753961,1675478215412320154, 65909583942401516528,547401364007816870552, 23406034074310130665241] |