The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 24 |
| 3 | 200 |
| 4 | 784 |
| 5 | 4840 |
| 6 | 9464 |
| 7 | 27744 |
| 8 | 43320 |
| 9 | 93104 |
| 10 | 235480 |
| 11 | 307520 |
| 12 | 624264 |
| 13 | 941360 |
| 14 | 1138984 |
| 15 | 1625824 |
| 16 | 2629224 |
| 17 | 4037960 |
| 18 | 4614040 |
| 19 | 6715544 |
| 20 | 8468880 |
| 21 | 9464304 |
| 22 | 12981280 |
| 23 | 15817144 |
| 24 | 20911440 |
| 25 | 29506624 |
| 26 | 34683400 |
| 27 | 37513424 |
| 28 | 43689384 |
[4,24,200,784,4840,9464,27744,43320,93104,235480, 307520,624264,941360,1138984,1625824,2629224, 4037960,4614040,6715544,8468880,9464304,12981280, 15817144,20911440,29506624,34683400,37513424, 43689384] |