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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 79 |
| 4 | 521 |
| 5 | 3876 |
| 6 | 31935 |
| 7 | 287225 |
| 8 | 2791122 |
| 9 | 29066589 |
| 10 | 322292257 |
| 11 | 3784650052 |
| 12 | 46857941291 |
| 13 | 609360372095 |
| 14 | 8296220760974 |
| 15 | 117914344818807 |
| 16 | 1745211622467633 |
| 17 | 26838798853062516 |
| 18 | 428009369349905497 |
| 19 | 7065576909286562195 |
| 20 | 120545067517808693300 |
| 21 | 2122393931891338237325 |
| 22 | 38512344746420591905771 |
[1,3,14,79,521,3876,31935,287225,2791122,29066589, 322292257,3784650052,46857941291,609360372095, 8296220760974,117914344818807,1745211622467633, 26838798853062516,428009369349905497, 7065576909286562195,120545067517808693300, 2122393931891338237325,38512344746420591905771] |