Permutations in S_n avoiding the patterns {4321, 34512, 45123, 35412, 43512, 45132, 45213, 53412, 45312, 45231}.

A191721

Permutations in S_n avoiding the patterns {4321, 34512, 45123, 35412, 43512, 45132, 45213, 53412, 45312, 45231}.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =94a(6) =391a(7) =1633a(8) =6827a(9) =28548a(10) =119384a(11) =499255a(12) =2087854a(13) =8731285a(14) =36513737a(15) =152698377a(16) =638575958a(17) =2670488470a(18) =11167831459a(19) =46703238346a(20) =195310296371a(21) =816776592369

External references