Number T(n,k) of permutations of [n] having exactly k consecutive triples j, j+1, j-1; triangle T(n,k), n>=0, 0<=k<=floor(n/3), read by rows.

A343535

Number T(n,k) of permutations of [n] having exactly k consecutive triples j, j+1, j-1; triangle T(n,k), n>=0, 0<=k<=floor(n/3), read by rows.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =1a(5) =20a(6) =4a(7) =102a(8) =18a(9) =626a(10) =92a(11) =2a(12) =4458a(13) =564a(14) =18a(15) =36144a(16) =4032a(17) =144a(18) =328794a(19) =32898a(20) =1182a(21) =6a(22) =3316944a(23) =301248a(24) =10512a(25) =96a(26) =36755520a(27) =3057840a(28) =102240a(29) =1200

External references