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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 19 |
| 5 | 27 |
| 6 | 863 |
| 7 | 1375 |
| 8 | 33953 |
| 9 | 57281 |
| 10 | 3250433 |
| 11 | 5675265 |
| 12 | 13695779093 |
| 13 | 24466579093 |
| 14 | 132282840127 |
| 15 | 240208245823 |
| 16 | 111956703448001 |
| 17 | 205804074290625 |
| 18 | 151711881512390095 |
| 19 | 281550972898020815 |
| 20 | 86560056264289860203 |
| 21 | 161867055619224199787 |
| 22 | 20953816286242674495191 |
| 23 | 39427936010479474495191 |
[-1,1,1,1,19,27,863,1375,33953,57281,3250433, 5675265,13695779093,24466579093,132282840127, 240208245823,111956703448001,205804074290625, 151711881512390095,281550972898020815, 86560056264289860203,161867055619224199787, 20953816286242674495191,39427936010479474495191] |