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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 16 |
| 5 | 43 |
| 6 | 114 |
| 7 | 300 |
| 8 | 784 |
| 9 | 2037 |
| 10 | 5266 |
| 11 | 13554 |
| 12 | 34752 |
| 13 | 88799 |
| 14 | 226210 |
| 15 | 574680 |
| 16 | 1456352 |
| 17 | 3682409 |
| 18 | 9292002 |
| 19 | 23403102 |
| 20 | 58842416 |
| 21 | 147713043 |
| 22 | 370262930 |
| 23 | 926852868 |
| 24 | 2317191024 |
| 25 | 5786293597 |
| 26 | 14433117938 |
| 27 | 35964267594 |
| 28 | 89528469088 |
| 29 | 222666575815 |
| 30 | 553319176770 |
[0,1,2,6,16,43,114,300,784,2037,5266,13554,34752, 88799,226210,574680,1456352,3682409,9292002, 23403102,58842416,147713043,370262930,926852868, 2317191024,5786293597,14433117938,35964267594, 89528469088,222666575815,553319176770] |