Diagonal sums of the Riordan matrix (1+x/sqrt(1-4*x),(1-sqrt(1-4*x))/2) (A189175).

A189177

Diagonal sums of the Riordan matrix (1+x/sqrt(1-4*x),(1-sqrt(1-4*x))/2) (A189175).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =88a(6) =311a(7) =1125a(8) =4139a(9) =15411a(10) =57901a(11) =219070a(12) =833509a(13) =3185834a(14) =12223298a(15) =47048989a(16) =181596815a(17) =702589992a(18) =2723964698a(19) =10580344863a(20) =41163089721a(21) =160380285133a(22) =625698670720

External references