The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 5 |
| 6 | 9 |
| 7 | 16 |
| 8 | 30 |
| 9 | 52 |
| 10 | 91 |
| 11 | 161 |
| 12 | 282 |
| 13 | 490 |
| 14 | 851 |
| 15 | 1471 |
| 16 | 2535 |
| 17 | 4361 |
| 18 | 7483 |
| 19 | 12800 |
| 20 | 21845 |
| 21 | 37210 |
| 22 | 63258 |
| 23 | 107329 |
| 24 | 181775 |
| 25 | 307341 |
| 26 | 518821 |
| 27 | 874492 |
| 28 | 1471869 |
| 29 | 2473969 |
| 30 | 4153018 |
| 31 | 6963137 |
| 32 | 11661191 |
| 33 | 19507566 |
| 34 | 32599451 |
| 35 | 54423609 |
| 36 | 90772692 |
| 37 | 151263317 |
| 38 | 251849623 |
[0,1,1,3,5,9,16,30,52,91,161,282,490,851,1471, 2535,4361,7483,12800,21845,37210,63258,107329, 181775,307341,518821,874492,1471869,2473969, 4153018,6963137,11661191,19507566,32599451, 54423609,90772692,151263317,251849623] |