Central coefficients of triangle A096815.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =17a(5) =42a(6) =118a(7) =320a(8) =861a(9) =2442a(10) =6658a(11) =18686a(12) =52100a(13) =146832a(14) =410990a(15) =1161722a(16) =3282403a(17) =9283968a(18) =26336598a(19) =74712158a(20) =212613094a(21) =605118528a(22) =1726261816a(23) =4926677982a(24) =14079210098a(25) =40247549662a(26) =115175011608a(27) =329707161766a(28) =944566633454