A Galton triangle: T(n,k) = (2k-1)*(T(n-1,k) + T(n-1,k-1)): a type B analog of the ordered Bell numbers A019538.

A186695

A Galton triangle: T(n,k) = (2k-1)*(T(n-1,k) + T(n-1,k-1)): a type B analog of the ordered Bell numbers A019538.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =1a(4) =12a(5) =15a(6) =1a(7) =39a(8) =135a(9) =105a(10) =1a(11) =120a(12) =870a(13) =1680a(14) =945a(15) =1a(16) =363a(17) =4950a(18) =17850a(19) =23625a(20) =10395a(21) =1a(22) =1092a(23) =26565a(24) =159600a(25) =373275a(26) =374220a(27) =135135a(28) =1a(29) =3279

External references