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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 60 |
| 3 | 310 |
| 4 | 1640 |
| 5 | 8910 |
| 6 | 51066 |
| 7 | 294546 |
| 8 | 1710184 |
| 9 | 10051522 |
| 10 | 59273370 |
| 11 | 350336326 |
| 12 | 2076929912 |
| 13 | 12328636710 |
| 14 | 73241168202 |
| 15 | 435453806538 |
| 16 | 2590088923960 |
| 17 | 15409982499130 |
| 18 | 91703551575882 |
| 19 | 545793722630878 |
| 20 | 3248685323916392 |
[15,60,310,1640,8910,51066,294546,1710184, 10051522,59273370,350336326,2076929912, 12328636710,73241168202,435453806538, 2590088923960,15409982499130,91703551575882, 545793722630878,3248685323916392] |