n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 18 |
4 | 81 |
5 | 396 |
6 | 1936 |
7 | 9416 |
8 | 45796 |
9 | 234972 |
10 | 1205604 |
11 | 6188328 |
12 | 31764496 |
13 | 162249168 |
14 | 828748944 |
15 | 4224034452 |
16 | 21529399441 |
17 | 113085801048 |
18 | 593996986944 |
19 | 3126735424128 |
20 | 16458794619136 |
21 | 86717178000000 |
22 | 456890625000000 |
23 | 2407551579000000 |
24 | 12686416153856064 |
25 | 66648950832253248 |
26 | 350144800010358336 |
27 | 1838080630013808960 |
28 | 9648980656951105600 |
29 | 50559912359694495680 |
[1,1,4,18,81,396,1936,9416,45796,234972,1205604, 6188328,31764496,162249168,828748944,4224034452, 21529399441,113085801048,593996986944, 3126735424128,16458794619136,86717178000000, 456890625000000,2407551579000000, 12686416153856064,66648950832253248, 350144800010358336,1838080630013808960, 9648980656951105600,50559912359694495680] |