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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 40 |
| 5 | 136 |
| 6 | 512 |
| 7 | 2080 |
| 8 | 8320 |
| 9 | 32896 |
| 10 | 131072 |
| 11 | 524800 |
| 12 | 2099200 |
| 13 | 8390656 |
| 14 | 33554432 |
| 15 | 134225920 |
| 16 | 536903680 |
| 17 | 2147516416 |
| 18 | 8589934592 |
| 19 | 34359869440 |
| 20 | 137439477760 |
| 21 | 549756338176 |
| 22 | 2199023255552 |
| 23 | 8796095119360 |
| 24 | 35184380477440 |
| 25 | 140737496743936 |
| 26 | 562949953421312 |
[1,1,2,10,40,136,512,2080,8320,32896,131072, 524800,2099200,8390656,33554432,134225920, 536903680,2147516416,8589934592,34359869440, 137439477760,549756338176,2199023255552, 8796095119360,35184380477440,140737496743936, 562949953421312] |