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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 8 |
| 3 | 48 |
| 4 | 224 |
| 5 | 960 |
| 6 | 3968 |
| 7 | 16128 |
| 8 | 65024 |
| 9 | 261120 |
| 10 | 1046528 |
| 11 | 4190208 |
| 12 | 16769024 |
| 13 | 67092480 |
| 14 | 268402688 |
| 15 | 1073676288 |
| 16 | 4294836224 |
| 17 | 17179607040 |
| 18 | 68718952448 |
| 19 | 274876858368 |
| 20 | 1099509530624 |
| 21 | 4398042316800 |
| 22 | 17592177655808 |
| 23 | 70368727400448 |
| 24 | 281474943156224 |
[0,0,8,48,224,960,3968,16128,65024,261120,1046528, 4190208,16769024,67092480,268402688,1073676288, 4294836224,17179607040,68718952448,274876858368, 1099509530624,4398042316800,17592177655808, 70368727400448,281474943156224] |