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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 3 |
| 8 | 10 |
| 9 | 24 |
| 10 | 56 |
| 11 | 114 |
| 12 | 224 |
| 13 | 411 |
| 14 | 733 |
| 15 | 1252 |
| 16 | 2091 |
| 17 | 3393 |
| 18 | 5408 |
| 19 | 8440 |
| 20 | 12982 |
| 21 | 19650 |
| 22 | 29388 |
| 23 | 43394 |
| 24 | 63430 |
| 25 | 91754 |
| 26 | 131584 |
| 27 | 187057 |
| 28 | 263932 |
| 29 | 369624 |
| 30 | 514253 |
| 31 | 710838 |
| 32 | 976876 |
| 33 | 1334828 |
| 34 | 1814492 |
| 35 | 2454011 |
| 36 | 3303436 |
| 37 | 4426627 |
| 38 | 5906599 |
| 39 | 7848883 |
| 40 | 10389557 |
[0,0,0,0,0,1,3,10,24,56,114,224,411,733,1252,2091, 3393,5408,8440,12982,19650,29388,43394,63430, 91754,131584,187057,263932,369624,514253,710838, 976876,1334828,1814492,2454011,3303436,4426627, 5906599,7848883,10389557] |