The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 13 |
| 6 | 20 |
| 7 | 43 |
| 8 | 62 |
| 9 | 113 |
| 10 | 224 |
| 11 | 367 |
| 12 | 494 |
| 13 | 833 |
| 14 | 1815 |
| 15 | 3379 |
| 16 | 5551 |
| 17 | 9169 |
| 18 | 17864 |
| 19 | 32978 |
| 20 | 58964 |
| 21 | 106218 |
| 22 | 131313 |
| 23 | 155719 |
| 24 | 180118 |
| 25 | 591890 |
| 26 | 881467 |
| 27 | 1345004 |
| 28 | 3012446 |
| 29 | 5728819 |
| 30 | 9309579 |
| 31 | 17512700 |
| 32 | 25641318 |
| 33 | 52978675 |
| 34 | 61998980 |
| 35 | 125130665 |
| 36 | 244636214 |
| 37 | 280766754 |
| 38 | 566273517 |
| 39 | 1031389697 |
| 40 | 2182394227 |
| 41 | 3045423658 |
| 42 | 3454917187 |
[0,1,3,6,13,20,43,62,113,224,367,494,833,1815, 3379,5551,9169,17864,32978,58964,106218,131313, 155719,180118,591890,881467,1345004,3012446, 5728819,9309579,17512700,25641318,52978675, 61998980,125130665,244636214,280766754,566273517, 1031389697,2182394227,3045423658,3454917187] |