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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 11 |
| 4 | 50 |
| 5 | 214 |
| 6 | 892 |
| 7 | 3667 |
| 8 | 14954 |
| 9 | 60674 |
| 10 | 245348 |
| 11 | 989790 |
| 12 | 3986292 |
| 13 | 16034316 |
| 14 | 64434424 |
| 15 | 258740611 |
| 16 | 1038384154 |
| 17 | 4165322506 |
| 18 | 16702230484 |
| 19 | 66952213546 |
| 20 | 268313786524 |
| 21 | 1075045360756 |
| 22 | 4306563947464 |
| 23 | 17249126430766 |
| 24 | 69078840030340 |
| 25 | 276613030309204 |
| 26 | 1107532553770472 |
| 27 | 4434066076454492 |
[0,2,11,50,214,892,3667,14954,60674,245348,989790, 3986292,16034316,64434424,258740611,1038384154, 4165322506,16702230484,66952213546,268313786524, 1075045360756,4306563947464,17249126430766, 69078840030340,276613030309204,1107532553770472, 4434066076454492] |