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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 34 |
| 4 | 116 |
| 5 | 332 |
| 6 | 948 |
| 7 | 2450 |
| 8 | 6126 |
| 9 | 15522 |
| 10 | 34938 |
| 11 | 77676 |
| 12 | 164746 |
| 13 | 338024 |
| 14 | 666934 |
| 15 | 1283264 |
| 16 | 2393329 |
| 17 | 4361006 |
| 18 | 7753340 |
| 19 | 13502336 |
| 20 | 23035680 |
| 21 | 38603394 |
| 22 | 63558590 |
| 23 | 103010192 |
| 24 | 164426156 |
| 25 | 258818678 |
| 26 | 401977394 |
| 27 | 616628128 |
| 28 | 934719004 |
| 29 | 1401251614 |
| 30 | 2078441930 |
[1,2,10,34,116,332,948,2450,6126,15522,34938, 77676,164746,338024,666934,1283264,2393329, 4361006,7753340,13502336,23035680,38603394, 63558590,103010192,164426156,258818678,401977394, 616628128,934719004,1401251614,2078441930] |