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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 47 |
| 6 | 173 |
| 7 | 702 |
| 8 | 3124 |
| 9 | 14901 |
| 10 | 76405 |
| 11 | 417210 |
| 12 | 2411466 |
| 13 | 14731095 |
| 14 | 94573911 |
| 15 | 636575050 |
| 16 | 4480990936 |
| 17 | 32887804361 |
| 18 | 251236573561 |
| 19 | 1993395483746 |
| 20 | 16397468177406 |
| 21 | 139634290253907 |
| 22 | 1229013163330947 |
| 23 | 11166172488138322 |
| 24 | 104593176077399652 |
[1,1,2,5,14,47,173,702,3124,14901,76405,417210, 2411466,14731095,94573911,636575050,4480990936, 32887804361,251236573561,1993395483746, 16397468177406,139634290253907,1229013163330947, 11166172488138322,104593176077399652] |