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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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 18 |
| 5 | 48 |
| 6 | 131 |
| 7 | 355 |
| 8 | 966 |
| 9 | 2626 |
| 10 | 7137 |
| 11 | 19401 |
| 12 | 52737 |
| 13 | 143354 |
| 14 | 389676 |
| 15 | 1059250 |
| 16 | 2879341 |
| 17 | 7826860 |
| 18 | 21275612 |
| 19 | 57833109 |
| 20 | 157206689 |
| 21 | 427332086 |
| 22 | 1161609045 |
| 23 | 3157580760 |
| 24 | 8583194401 |
| 25 | 23331541370 |
| 26 | 63421704936 |
| 27 | 172398068059 |
| 28 | 468626535665 |
| 29 | 1273858996233 |
[0,1,2,7,18,48,131,355,966,2626,7137,19401,52737, 143354,389676,1059250,2879341,7826860,21275612, 57833109,157206689,427332086,1161609045, 3157580760,8583194401,23331541370,63421704936, 172398068059,468626535665,1273858996233] |