A symmetrical triangle based on Narayana numbers and Eulerian numbers of type B: T(n, k) = 2 + A060187(n, k) - 2*binomial(n, k)*binomial(n+1, k)/(k+1).

A176291

A symmetrical triangle based on Narayana numbers and Eulerian numbers of type B: T(n, k) = 2 + A060187(n, k) - 2*binomial(n, k)*binomial(n+1, k)/(k+1).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =13a(8) =13a(9) =1a(10) =1a(11) =58a(12) =192a(13) =58a(14) =1a(15) =1a(16) =209a(17) =1584a(18) =1584a(19) =209a(20) =1a(21) =1a(22) =682a(23) =10335a(24) =23200a(25) =10335a(26) =682a(27) =1a(28) =1a(29) =2125

External references