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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 36 |
| 5 | 126 |
| 6 | 376 |
| 7 | 1004 |
| 8 | 2469 |
| 9 | 5688 |
| 10 | 12434 |
| 11 | 26012 |
| 12 | 52428 |
| 13 | 102326 |
| 14 | 194180 |
| 15 | 359436 |
| 16 | 650740 |
| 17 | 1154850 |
| 18 | 2012765 |
| 19 | 3450684 |
| 20 | 5827214 |
| 21 | 9704648 |
| 22 | 15955728 |
| 23 | 25922184 |
| 24 | 41648520 |
| 25 | 66224182 |
| 26 | 104281142 |
| 27 | 162712832 |
| 28 | 251706732 |
| 29 | 386218990 |
| 30 | 588069016 |
| 31 | 888899176 |
| 32 | 1334336593 |
| 33 | 1989817604 |
| 34 | 2948702406 |
[0,0,1,8,36,126,376,1004,2469,5688,12434,26012, 52428,102326,194180,359436,650740,1154850,2012765, 3450684,5827214,9704648,15955728,25922184, 41648520,66224182,104281142,162712832,251706732, 386218990,588069016,888899176,1334336593, 1989817604,2948702406] |