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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 68 |
| 4 | 621 |
| 5 | 2426 |
| 6 | 6955 |
| 7 | 16656 |
| 8 | 36578 |
| 9 | 76332 |
| 10 | 153813 |
| 11 | 303761 |
| 12 | 591012 |
| 13 | 1135722 |
| 14 | 2162149 |
| 15 | 4084667 |
| 16 | 7664486 |
| 17 | 14298612 |
| 18 | 26540583 |
| 19 | 49040949 |
| 20 | 90250160 |
| 21 | 165483166 |
| 22 | 302426113 |
| 23 | 551024879 |
| 24 | 1001197818 |
| 25 | 1814514216 |
| 26 | 3280781211 |
| 27 | 5918961481 |
[0,1,68,621,2426,6955,16656,36578,76332,153813, 303761,591012,1135722,2162149,4084667,7664486, 14298612,26540583,49040949,90250160,165483166, 302426113,551024879,1001197818,1814514216, 3280781211,5918961481] |