Riordan array (1/(1-x),xc(x)/(1-xc(x))) where c(x)is the g.f. of A000108.It factorizes as A007318*A106566.

A168216

Riordan array (1/(1-x),xc(x)/(1-xc(x))) where c(x)is the g.f. of A000108.It factorizes as A007318*A106566.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =8a(8) =5a(9) =1a(10) =1a(11) =23a(12) =19a(13) =7a(14) =1a(15) =1a(16) =74a(17) =69a(18) =34a(19) =9a(20) =1a(21) =1a(22) =262a(23) =256a(24) =147a(25) =53a(26) =11a(27) =1a(28) =1a(29) =993

External references