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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 15 |
| 7 | 141 |
| 8 | 1066 |
| 9 | 7108 |
| 10 | 43747 |
| 11 | 255045 |
| 12 | 1431320 |
| 13 | 7814385 |
| 14 | 41804990 |
| 15 | 220266447 |
| 16 | 1147232914 |
| 17 | 5922585396 |
| 18 | 30367092789 |
| 19 | 154877631181 |
| 20 | 786633449995 |
| 21 | 3982378528296 |
| 22 | 20109428513990 |
| 23 | 101339359244739 |
| 24 | 509871884291730 |
| 25 | 2562078441467318 |
| 26 | 12861324297841420 |
[1,15,141,1066,7108,43747,255045,1431320,7814385, 41804990,220266447,1147232914,5922585396, 30367092789,154877631181,786633449995, 3982378528296,20109428513990,101339359244739, 509871884291730,2562078441467318, 12861324297841420] |