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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 28 |
| 4 | 122 |
| 5 | 496 |
| 6 | 2256 |
| 7 | 9801 |
| 8 | 45747 |
| 9 | 206259 |
| 10 | 976950 |
| 11 | 4504593 |
| 12 | 21541669 |
| 13 | 100830298 |
| 14 | 485452210 |
| 15 | 2297097380 |
| 16 | 11115666088 |
| 17 | 53025784640 |
| 18 | 257592489664 |
| 19 | 1236488167021 |
| 20 | 6025167656964 |
| 21 | 29064668106315 |
| 22 | 141980026810742 |
| 23 | 687621457319793 |
| 24 | 3365927252920391 |
| 25 | 16354699552381265 |
| 26 | 80194805724241141 |
[1,2,8,28,122,496,2256,9801,45747,206259,976950, 4504593,21541669,100830298,485452210,2297097380, 11115666088,53025784640,257592489664, 1236488167021,6025167656964,29064668106315, 141980026810742,687621457319793,3365927252920391, 16354699552381265,80194805724241141] |