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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 26 |
| 5 | 59 |
| 6 | 160 |
| 7 | 383 |
| 8 | 1018 |
| 9 | 2606 |
| 10 | 6836 |
| 11 | 17721 |
| 12 | 46580 |
| 13 | 121405 |
| 14 | 318212 |
| 15 | 832190 |
| 16 | 2179358 |
| 17 | 5702903 |
| 18 | 14933264 |
| 19 | 39088187 |
| 20 | 102341134 |
| 21 | 267915110 |
| 22 | 701426484 |
| 23 | 1836311925 |
| 24 | 4807575700 |
| 25 | 12586269265 |
| 26 | 32951401540 |
| 27 | 86267576506 |
| 28 | 225851752438 |
| 29 | 591286729907 |
| 30 | 1548009602240 |
| 31 | 4052739537911 |
[1,4,10,26,59,160,383,1018,2606,6836,17721,46580, 121405,318212,832190,2179358,5702903,14933264, 39088187,102341134,267915110,701426484,1836311925, 4807575700,12586269265,32951401540,86267576506, 225851752438,591286729907,1548009602240, 4052739537911] |