Number of valid hook configurations of 312-avoiding permutations of [n].

A307786

Number of valid hook configurations of 312-avoiding permutations of [n].

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =44a(6) =148a(7) =528a(8) =1972a(9) =7647a(10) =30605a(11) =125801a(12) =529131a(13) =2270481a(14) =9914870a(15) =43973755a(16) =197744417a(17) =900327160a(18) =4145285618a(19) =19280282194a(20) =90507546094a(21) =428476211848

External references