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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 81 |
| 5 | 349 |
| 6 | 1555 |
| 7 | 7053 |
| 8 | 32497 |
| 9 | 151005 |
| 10 | 708409 |
| 11 | 3344375 |
| 12 | 15879317 |
| 13 | 75743615 |
| 14 | 362725533 |
| 15 | 1742819393 |
| 16 | 8398499171 |
| 17 | 40573677013 |
| 18 | 196450014697 |
| 19 | 953043821113 |
| 20 | 4631611218959 |
| 21 | 22543961216383 |
| 22 | 109885301062387 |
| 23 | 536291022892125 |
| 24 | 2620369720961805 |
| 25 | 12816847429043339 |
| 26 | 62750550805668051 |
| 27 | 307494459419443003 |
[1,1,5,19,81,349,1555,7053,32497,151005,708409, 3344375,15879317,75743615,362725533,1742819393, 8398499171,40573677013,196450014697,953043821113, 4631611218959,22543961216383,109885301062387, 536291022892125,2620369720961805, 12816847429043339,62750550805668051, 307494459419443003] |