The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 160 |
| 3 | 9135 |
| 4 | 750400 |
| 5 | 80441425 |
| 6 | 10638828000 |
| 7 | 1673678753075 |
| 8 | 305252823558400 |
| 9 | 63325918470124125 |
| 10 | 14724939203560768000 |
| 11 | 3793154255510116564375 |
| 12 | 1072236911373050595840000 |
| 13 | 329985748809343574149723625 |
| 14 | 109830285822698899619230720000 |
| 15 | 39309730439858456963398059166875 |
| 16 | 15055402080033663459327206195200000 |
| 17 | 6143747797144623366547686616298003125 |
| 18 | 2661215654340427415860408455902822400000 |
| 19 | 1219479030123689259752174147774198563109375 |
| 20 | 589404548968234611551047396687998740070400000 |
| 21 | 299658512455145134987556717044427762586006890625 |
| 22 | 159865819819818837465659104892463315321094144000000 |
[1,5,160,9135,750400,80441425,10638828000, 1673678753075,305252823558400,63325918470124125, 14724939203560768000,3793154255510116564375, 1072236911373050595840000, 329985748809343574149723625, 109830285822698899619230720000, 39309730439858456963398059166875, 15055402080033663459327206195200000, 6143747797144623366547686616298003125, 2661215654340427415860408455902822400000, 1219479030123689259752174147774198563109375, 589404548968234611551047396687998740070400000, 299658512455145134987556717044427762586006890625, 15986581981981883746565910489246331532109414400000\ 0] |