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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 166 |
| 3 | 424 |
| 4 | 1446 |
| 5 | 5125 |
| 6 | 18273 |
| 7 | 62547 |
| 8 | 215175 |
| 9 | 740442 |
| 10 | 2539018 |
| 11 | 8753052 |
| 12 | 30227367 |
| 13 | 104305934 |
| 14 | 360259911 |
| 15 | 1244822173 |
| 16 | 4301556147 |
| 17 | 14870776980 |
| 18 | 51423668704 |
| 19 | 177844888394 |
| 20 | 615173366886 |
| 21 | 2128240710669 |
| 22 | 7363527937824 |
| 23 | 25479651392988 |
[3,166,424,1446,5125,18273,62547,215175,740442, 2539018,8753052,30227367,104305934,360259911, 1244822173,4301556147,14870776980,51423668704, 177844888394,615173366886,2128240710669, 7363527937824,25479651392988] |