OFFSET
0,2
COMMENTS
Riordan Array (1/(1-x)^3,x/(1-x)).
Sum_{m=0..n} T(n,m) = A055990(n-1).
FORMULA
G.f.: 1/(1-x)^3/(1-y*x/(1-x)^4).
EXAMPLE
1,
3, 1,
6, 7, 1,
10, 28, 11, 1,
15, 84, 66, 15, 1,
21, 210, 286, 120, 19, 1,
28, 462, 1001, 680, 190, 23, 1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Vladimir Kruchinin, Nov 17 2020
STATUS
approved