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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 26 |
| 4 | 88 |
| 5 | 269 |
| 6 | 843 |
| 7 | 2456 |
| 8 | 7115 |
| 9 | 19892 |
| 10 | 54756 |
| 11 | 147355 |
| 12 | 390517 |
| 13 | 1017091 |
| 14 | 2612670 |
| 15 | 6617641 |
| 16 | 16556913 |
| 17 | 40933339 |
| 18 | 100104289 |
| 19 | 242276236 |
| 20 | 580718077 |
| 21 | 1379161494 |
| 22 | 3247074738 |
| 23 | 7581837910 |
| 24 | 17564867853 |
| 25 | 40388447308 |
| 26 | 92206496318 |
| 27 | 209069338580 |
| 28 | 470944571003 |
| 29 | 1054178579266 |
| 30 | 2345477963043 |
| 31 | 5188246121144 |
| 32 | 11412352653001 |
[1,1,8,26,88,269,843,2456,7115,19892,54756,147355, 390517,1017091,2612670,6617641,16556913,40933339, 100104289,242276236,580718077,1379161494, 3247074738,7581837910,17564867853,40388447308, 92206496318,209069338580,470944571003, 1054178579266,2345477963043,5188246121144, 11412352653001] |