Number of 0..3 arrays x(0..n+1) of n+2 elements without any interior element greater than both neighbors or less than both neighbors.
A200866
Number of 0..3 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) =36a(1) =94a(2) =236a(3) =602a(4) =1528a(5) =3882a(6) =9858a(7) =25038a(8) =63592a(9) =161514a(10) =410218a(11) =1041884a(12) =2646208a(13) =6720920a(14) =17069998a(15) =43354902a(16) =110114102a(17) =279671154a(18) =710317326a(19) =1804085608a(20) =4582071648a(21) =11637685314a(22) =29557748082a(23) =75071670020a(24) =190669317026a(25) =484267746348
External references
- oeis: A200866