The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 8 |
| 4 | 41 |
| 5 | 208 |
| 6 | 856 |
| 7 | 3552 |
| 8 | 14172 |
| 9 | 56462 |
| 10 | 223292 |
| 11 | 881656 |
| 12 | 3475141 |
| 13 | 13688112 |
| 14 | 53891760 |
| 15 | 212145608 |
| 16 | 835111160 |
| 17 | 3287779006 |
| 18 | 12946154944 |
| 19 | 50989472460 |
| 20 | 200879577216 |
| 21 | 791617503410 |
| 22 | 3120501139160 |
| 23 | 12304529289928 |
| 24 | 48533074308046 |
| 25 | 191488113441258 |
| 26 | 755744827552836 |
| 27 | 2983563960355832 |
[1,8,41,208,856,3552,14172,56462,223292,881656, 3475141,13688112,53891760,212145608,835111160, 3287779006,12946154944,50989472460,200879577216, 791617503410,3120501139160,12304529289928, 48533074308046,191488113441258,755744827552836, 2983563960355832] |