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| n | a(n) |
|---|---|
| 1 | 2680 |
| 2 | 4743 |
| 3 | 9312 |
| 4 | 19794 |
| 5 | 51024 |
| 6 | 125554 |
| 7 | 278710 |
| 8 | 763726 |
| 9 | 1944090 |
| 10 | 4393122 |
| 11 | 12184346 |
| 12 | 31155178 |
| 13 | 70732458 |
| 14 | 196510762 |
| 15 | 502312306 |
| 16 | 1143167546 |
| 17 | 3175587782 |
| 18 | 8108392378 |
| 19 | 18490987722 |
| 20 | 51342152722 |
| 21 | 130937041938 |
| 22 | 299194452074 |
[2680,4743,9312,19794,51024,125554,278710,763726, 1944090,4393122,12184346,31155178,70732458, 196510762,502312306,1143167546,3175587782, 8108392378,18490987722,51342152722,130937041938, 299194452074] |