The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 12 |
| 6 | 20 |
| 7 | 34 |
| 8 | 58 |
| 9 | 101 |
| 10 | 178 |
| 11 | 318 |
| 12 | 574 |
| 13 | 1046 |
| 14 | 1920 |
| 15 | 3548 |
| 16 | 6593 |
| 17 | 12312 |
| 18 | 23092 |
| 19 | 43480 |
| 20 | 82154 |
| 21 | 155716 |
| 22 | 295984 |
| 23 | 564050 |
| 24 | 1077400 |
| 25 | 2062311 |
| 26 | 3955186 |
| 27 | 7598756 |
| 28 | 14622318 |
| 29 | 28179338 |
| 30 | 54379520 |
| 31 | 105071498 |
| 32 | 203254164 |
| 33 | 393607534 |
| 34 | 763001000 |
| 35 | 1480458656 |
| 36 | 2875091021 |
| 37 | 5588152920 |
| 38 | 10869906136 |
[0,1,2,4,7,12,20,34,58,101,178,318,574,1046,1920, 3548,6593,12312,23092,43480,82154,155716,295984, 564050,1077400,2062311,3955186,7598756,14622318, 28179338,54379520,105071498,203254164,393607534, 763001000,1480458656,2875091021,5588152920, 10869906136] |