Number of 0..2 arrays x(0..n+1) of n+2 elements without any interior element greater than both neighbors or less than both neighbors.
A200865
Number of 0..2 arrays x(0..n+1) of n+2 elements without any interior element greater than both neighbors or less than both neighbors.
Terms
- a(0) =17a(1) =37a(2) =77a(3) =163a(4) =343a(5) =723a(6) =1523a(7) =3209a(8) =6761a(9) =14245a(10) =30013a(11) =63235a(12) =133231a(13) =280707a(14) =591427a(15) =1246089a(16) =2625409a(17) =5531525a(18) =11654477a(19) =24555043a(20) =51735495a(21) =109002515a(22) =229659507a(23) =483874057a(24) =1019483609a(25) =2147969733a(26) =4525598973a(27) =9535072003
External references
- oeis: A200865