Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, up.
A177527
Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, up.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =120a(6) =694a(7) =4676a(8) =35952a(9) =310464a(10) =2984176a(11) =31536583a(12) =363591384a(13) =4541789148a(14) =61089594448a(15) =880428095803
External references
- oeis: A177527