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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 7 |
| 4 | 33 |
| 5 | 131 |
| 6 | 473 |
| 7 | 1611 |
| 8 | 5281 |
| 9 | 16867 |
| 10 | 52905 |
| 11 | 163835 |
| 12 | 502769 |
| 13 | 1532883 |
| 14 | 4651897 |
| 15 | 14070379 |
| 16 | 42456897 |
| 17 | 127894979 |
| 18 | 384799049 |
| 19 | 1156756443 |
| 20 | 3475250065 |
| 21 | 10436235955 |
| 22 | 31330727961 |
| 23 | 94038321227 |
| 24 | 282211432673 |
| 25 | 846835624611 |
| 26 | 2540926304233 |
| 27 | 7623651327931 |
| 28 | 22872765923121 |
[0,0,1,7,33,131,473,1611,5281,16867,52905,163835, 502769,1532883,4651897,14070379,42456897, 127894979,384799049,1156756443,3475250065, 10436235955,31330727961,94038321227,282211432673, 846835624611,2540926304233,7623651327931, 22872765923121] |