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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 50 |
| 4 | 383 |
| 5 | 4202 |
| 6 | 62300 |
| 7 | 1198428 |
| 8 | 29017293 |
| 9 | 863493787 |
| 10 | 30975247186 |
| 11 | 1318153524258 |
| 12 | 65653348649840 |
| 13 | 3783468780457767 |
| 14 | 249776134158583129 |
| 15 | 18727323882572742567 |
| 16 | 1582533328237963169244 |
| 17 | 149708251167591777011868 |
| 18 | 15759134055081397060853633 |
| 19 | 1835935033229837610653436592 |
[1,3,10,50,383,4202,62300,1198428,29017293, 863493787,30975247186,1318153524258, 65653348649840,3783468780457767, 249776134158583129,18727323882572742567, 1582533328237963169244,149708251167591777011868, 15759134055081397060853633, 1835935033229837610653436592] |