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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 9 |
| 5 | 16 |
| 6 | 28 |
| 7 | 43 |
| 8 | 73 |
| 9 | 130 |
| 10 | 226 |
| 11 | 386 |
| 12 | 660 |
| 13 | 1132 |
| 14 | 1947 |
| 15 | 3349 |
| 16 | 5753 |
| 17 | 9878 |
| 18 | 16966 |
| 19 | 29147 |
| 20 | 50074 |
| 21 | 86020 |
| 22 | 147764 |
| 23 | 253829 |
| 24 | 436036 |
| 25 | 749041 |
| 26 | 1286728 |
| 27 | 2210377 |
| 28 | 3797047 |
| 29 | 6522681 |
| 30 | 11204863 |
| 31 | 19248056 |
| 32 | 33064889 |
| 33 | 56799857 |
| 34 | 97572504 |
| 35 | 167612993 |
| 36 | 287930658 |
| 37 | 494615964 |
[1,1,4,9,16,28,43,73,130,226,386,660,1132,1947, 3349,5753,9878,16966,29147,50074,86020,147764, 253829,436036,749041,1286728,2210377,3797047, 6522681,11204863,19248056,33064889,56799857, 97572504,167612993,287930658,494615964] |