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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 8 |
| 6 | 14 |
| 7 | 26 |
| 8 | 46 |
| 9 | 85 |
| 10 | 155 |
| 11 | 286 |
| 12 | 528 |
| 13 | 980 |
| 14 | 1824 |
| 15 | 3410 |
| 16 | 6392 |
| 17 | 12022 |
| 18 | 22675 |
| 19 | 42885 |
| 20 | 81312 |
| 21 | 154540 |
| 22 | 294362 |
| 23 | 561849 |
| 24 | 1074463 |
| 25 | 2058462 |
| 26 | 3950220 |
| 27 | 7592403 |
| 28 | 14614105 |
| 29 | 28168227 |
| 30 | 54363000 |
| 31 | 105043517 |
| 32 | 203200635 |
| 33 | 393496975 |
| 34 | 762765642 |
| 35 | 1479957400 |
| 36 | 2874038529 |
| 37 | 5585986973 |
| 38 | 10865544853 |
| 39 | 21150913457 |
| 40 | 41201771886 |
[0,1,1,3,4,8,14,26,46,85,155,286,528,980,1824, 3410,6392,12022,22675,42885,81312,154540,294362, 561849,1074463,2058462,3950220,7592403,14614105, 28168227,54363000,105043517,203200635,393496975, 762765642,1479957400,2874038529,5585986973, 10865544853,21150913457,41201771886] |