The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 16 |
| 5 | 36 |
| 6 | 64 |
| 7 | 218 |
| 8 | 752 |
| 9 | 1104 |
| 10 | 2112 |
| 11 | 4096 |
| 12 | 9608 |
| 13 | 45960 |
| 14 | 90416 |
| 15 | 178944 |
| 16 | 266496 |
| 17 | 528384 |
| 18 | 1048576 |
| 19 | 1540944 |
| 20 | 9133760 |
| 21 | 22692704 |
| 22 | 45277312 |
| 23 | 30194176 |
| 24 | 90196736 |
| 25 | 180011008 |
| 26 | 135032832 |
| 27 | 269500416 |
| 28 | 537919488 |
| 29 | 1073741824 |
[1,1,3,4,16,36,64,218,752,1104,2112,4096,9608, 45960,90416,178944,266496,528384,1048576,1540944, 9133760,22692704,45277312,30194176,90196736, 180011008,135032832,269500416,537919488, 1073741824] |