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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 19 |
| 6 | 42 |
| 7 | 92 |
| 8 | 203 |
| 9 | 453 |
| 10 | 1018 |
| 11 | 2300 |
| 12 | 5224 |
| 13 | 11919 |
| 14 | 27301 |
| 15 | 62750 |
| 16 | 144662 |
| 17 | 334392 |
| 18 | 774802 |
| 19 | 1799089 |
| 20 | 4185524 |
| 21 | 9754468 |
| 22 | 22769099 |
| 23 | 53225213 |
| 24 | 124585182 |
| 25 | 291975928 |
| 26 | 685044632 |
| 27 | 1608962053 |
| 28 | 3782645385 |
| 29 | 8901012965 |
| 30 | 20962890607 |
| 31 | 49409138924 |
| 32 | 116543063346 |
| 33 | 275086432485 |
[1,1,2,4,9,19,42,92,203,453,1018,2300,5224,11919, 27301,62750,144662,334392,774802,1799089,4185524, 9754468,22769099,53225213,124585182,291975928, 685044632,1608962053,3782645385,8901012965, 20962890607,49409138924,116543063346,275086432485] |