The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 1 |
| 3 | 12 |
| 4 | 6 |
| 5 | 1 |
| 6 | 54 |
| 7 | 33 |
| 8 | 9 |
| 9 | 1 |
| 10 | 261 |
| 11 | 180 |
| 12 | 63 |
| 13 | 12 |
| 14 | 1 |
| 15 | 1323 |
| 16 | 990 |
| 17 | 405 |
| 18 | 102 |
| 19 | 15 |
| 20 | 1 |
| 21 | 6939 |
| 22 | 5508 |
| 23 | 2511 |
| 24 | 756 |
| 25 | 150 |
| 26 | 18 |
| 27 | 1 |
| 28 | 37341 |
| 29 | 30996 |
| 30 | 15309 |
| 31 | 5229 |
| 32 | 1260 |
| 33 | 207 |
| 34 | 21 |
| 35 | 1 |
| 36 | 205011 |
| 37 | 176256 |
| 38 | 92610 |
| 39 | 34776 |
| 40 | 9630 |
| 41 | 1944 |
| 42 | 273 |
| 43 | 24 |
| 44 | 1 |
| 45 | 1143801 |
| 46 | 1011609 |
| 47 | 558414 |
| 48 | 225828 |
| 49 | 69498 |
| 50 | 16281 |
| 51 | 2835 |
| 52 | 348 |
| 53 | 27 |
| 54 | 1 |
[1,3,1,12,6,1,54,33,9,1,261,180,63,12,1,1323,990, 405,102,15,1,6939,5508,2511,756,150,18,1,37341, 30996,15309,5229,1260,207,21,1,205011,176256, 92610,34776,9630,1944,273,24,1,1143801,1011609, 558414,225828,69498,16281,2835,348,27,1] |