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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 44 |
| 5 | 153 |
| 6 | 638 |
| 7 | 2443 |
| 8 | 10468 |
| 9 | 42306 |
| 10 | 184576 |
| 11 | 772024 |
| 12 | 3411966 |
| 13 | 14612580 |
| 14 | 65212028 |
| 15 | 284126776 |
| 16 | 1277710146 |
| 17 | 5639805613 |
| 18 | 25519441118 |
| 19 | 113792116639 |
| 20 | 517542778146 |
| 21 | 2326572672034 |
| 22 | 10627523024268 |
| 23 | 48093423017929 |
| 24 | 220503392480274 |
| 25 | 1003378635817366 |
| 26 | 4615271568477192 |
| 27 | 21099242329057240 |
[1,1,4,11,44,153,638,2443,10468,42306,184576, 772024,3411966,14612580,65212028,284126776, 1277710146,5639805613,25519441118,113792116639, 517542778146,2326572672034,10627523024268, 48093423017929,220503392480274,1003378635817366, 4615271568477192,21099242329057240] |