A107065 - OEIS

%I #9 Feb 21 2024 08:18:46

%S 1,1,1,1,2,1,1,3,3,1,1,4,6,4,1,1,4,10,10,5,1,1,4,13,20,15,6,1,1,4,15,

%T 32,35,21,7,1,1,4,16,44,66,56,28,8,1,1,4,16,54,106,121,84,36,9,1,1,4,

%U 16,60,150,222,204,120,45,10,1,1,4,16,63,190,357,420,323,165,55,11,1,1,4,16

%N Riordan array (1/(1-x),x(1+x+x^2+x^3)).

%C Row sums are A107066. Diagonal sums are A023436(n+1).

%e Triangle begins

%e   1;

%e   1, 1;

%e   1, 2, 1;

%e   1, 3, 3, 1;

%e   1, 4, 6, 4, 1;

%e   1, 4, 10, 10, 5, 1;

%e   1, 4, 13, 20, 15, 6, 1;

%e   ...

%Y Cf. A107066, A023436.

%K easy,nonn,tabl

%O 0,5

%A _Paul Barry_, May 10 2005