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| n | a(n) |
|---|---|
| 1 | 14 |
| 2 | 196 |
| 3 | 474 |
| 4 | 2774 |
| 5 | 13902 |
| 6 | 55752 |
| 7 | 284272 |
| 8 | 1391724 |
| 9 | 6009486 |
| 10 | 29516206 |
| 11 | 141874800 |
| 12 | 636402740 |
| 13 | 3067035968 |
| 14 | 14596375694 |
| 15 | 66837402334 |
| 16 | 318789501330 |
| 17 | 1508938808590 |
| 18 | 6989272916424 |
| 19 | 33140915653520 |
| 20 | 156401252966536 |
| 21 | 729155025679178 |
[14,196,474,2774,13902,55752,284272,1391724, 6009486,29516206,141874800,636402740,3067035968, 14596375694,66837402334,318789501330, 1508938808590,6989272916424,33140915653520, 156401252966536,729155025679178] |