The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 1 |
| 5 | 7 |
| 6 | 21 |
| 7 | 1 |
| 8 | 15 |
| 9 | 35 |
| 10 | 105 |
| 11 | 315 |
| 12 | 1 |
| 13 | 31 |
| 14 | 155 |
| 15 | 465 |
| 16 | 1085 |
| 17 | 3255 |
| 18 | 9765 |
| 19 | 1 |
| 20 | 63 |
| 21 | 651 |
| 22 | 1395 |
| 23 | 1953 |
| 24 | 9765 |
| 25 | 22785 |
| 26 | 29295 |
| 27 | 68355 |
| 28 | 205065 |
| 29 | 615195 |
| 30 | 1 |
| 31 | 127 |
| 32 | 2667 |
| 33 | 11811 |
| 34 | 8001 |
| 35 | 82677 |
| 36 | 177165 |
| 37 | 413385 |
| 38 | 248031 |
| 39 | 1240155 |
| 40 | 2893695 |
| 41 | 3720465 |
| 42 | 8681085 |
| 43 | 26043255 |
| 44 | 78129765 |
[1,1,3,1,7,21,1,15,35,105,315,1,31,155,465,1085, 3255,9765,1,63,651,1395,1953,9765,22785,29295, 68355,205065,615195,1,127,2667,11811,8001,82677, 177165,413385,248031,1240155,2893695,3720465, 8681085,26043255,78129765] |