A174302 - OEIS

%I #5 Mar 30 2012 18:59:27

%S 1,1,1,2,2,1,6,5,3,1,19,15,9,4,1,63,48,29,14,5,1,215,160,97,49,20,6,1,

%T 749,548,333,173,76,27,7,1,2650,1914,1165,617,284,111,35,8,1,9490,

%U 6785,4135,2221,1056,439,155,44,9,1

%N Riordan array ((1-x^2c(x)^2)/(1-xc(x)-x^2c(x)^2),xc(x)), c(x) the g.f. of A000108.

%C First row is essentially A109262.

%e Triangle begins

%e 1,

%e 1, 1,

%e 2, 2, 1,

%e 6, 5, 3, 1,

%e 19, 15, 9, 4, 1,

%e 63, 48, 29, 14, 5, 1,

%e 215, 160, 97, 49, 20, 6, 1,

%e 749, 548, 333, 173, 76, 27, 7, 1,

%e Production matrix begins

%e 1, 1,

%e 1, 1, 1,

%e 2, 1, 1, 1,

%e 2, 1, 1, 1, 1,

%e 3, 1, 1, 1, 1, 1,

%e 3, 1, 1, 1, 1, 1, 1,

%e 4, 1, 1, 1, 1, 1, 1, 1

%K easy,nonn,tabl

%O 0,4

%A _Paul Barry_, Mar 15 2010