Number of 0..4 arrays x(0..n+1) of n+2 elements without any interior element greater than both neighbors or less than both neighbors.
A200867
Number of 0..4 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) =65a(1) =195a(2) =567a(3) =1673a(4) =4917a(5) =14455a(6) =42479a(7) =124851a(8) =366959a(9) =1078565a(10) =3170093a(11) =9317449a(12) =27385589a(13) =80491001a(14) =236577045a(15) =695341043a(16) =2043728099a(17) =6006871845a(18) =17655239697a(19) =51891816107a(20) =152519060911a(21) =448280011791
External references
- oeis: A200867