Number of permutations of 1..n with displacements restricted to {-6,-5,-4,-1,0,2,3}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =35a(6) =126a(7) =368a(8) =920a(9) =2285a(10) =5896a(11) =15456a(12) =41206a(13) =111892a(14) =304175a(15) =816621a(16) =2172175a(17) =5772781a(18) =15372397a(19) =41000988a(20) =109503212a(21) =292725922a(22) =782460503a(23) =2090016819a(24) =5579586307a(25) =14894046299a(26) =39762451293a(27) =106166731292a(28) =283495287002