OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..1325 (rows 0..50)
FORMULA
G.f.: 1/(1 - 2*(1 + 2*y)*x + y*(2 + 3*y)*x^2). - Andrew Howroyd, Feb 18 2024
EXAMPLE
Triangle begins:
1;
2, 4;
4, 14, 13;
8, 40, 68, 40;
16, 104, 256, 284, 121;
32, 256, 824, 1336, 1094, 364;
64, 608, 2416, 5144, 6196, 4010, 1093;
128, 1408, 6656, 17536, 27824, 26608, 14216, 3280;
...
MATHEMATICA
(See A193846.)
PROG
(PARI) T(n)={[Vecrev(p) | p<-Vec(1/(1 - 2*(1 + 2*y)*x + y*(2 + 3*y)*x^2) + O(x*x^n))]}
{ my(A=T(10)); for(i=1, #A, print(A[i])) } \\ Andrew Howroyd, Feb 18 2024
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Aug 07 2011
STATUS
approved