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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 32 |
| 4 | 100 |
| 5 | 312 |
| 6 | 976 |
| 7 | 3056 |
| 8 | 9568 |
| 9 | 29952 |
| 10 | 93760 |
| 11 | 293504 |
| 12 | 918784 |
| 13 | 2876160 |
| 14 | 9003520 |
| 15 | 28184576 |
| 16 | 88228864 |
| 17 | 276191232 |
| 18 | 864587776 |
| 19 | 2706501632 |
| 20 | 8472420352 |
| 21 | 26522025984 |
| 22 | 83024429056 |
| 23 | 259899293696 |
| 24 | 813587562496 |
| 25 | 2546850791424 |
| 26 | 7972650090496 |
| 27 | 24957547446272 |
[1,3,10,32,100,312,976,3056,9568,29952,93760, 293504,918784,2876160,9003520,28184576,88228864, 276191232,864587776,2706501632,8472420352, 26522025984,83024429056,259899293696,813587562496, 2546850791424,7972650090496,24957547446272] |