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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 17 |
| 4 | 76 |
| 5 | 352 |
| 6 | 1667 |
| 7 | 8017 |
| 8 | 38992 |
| 9 | 191276 |
| 10 | 944648 |
| 11 | 4690688 |
| 12 | 23396023 |
| 13 | 117130483 |
| 14 | 588267604 |
| 15 | 2962532945 |
| 16 | 14954741680 |
| 17 | 75647585152 |
| 18 | 383359922324 |
| 19 | 1945925312492 |
| 20 | 9891894347360 |
| 21 | 50350481125000 |
| 22 | 256592858798416 |
| 23 | 1309047896676352 |
| 24 | 6684914267741951 |
| 25 | 34168808617063927 |
[1,1,4,17,76,352,1667,8017,38992,191276,944648, 4690688,23396023,117130483,588267604,2962532945, 14954741680,75647585152,383359922324, 1945925312492,9891894347360,50350481125000, 256592858798416,1309047896676352,6684914267741951, 34168808617063927] |