OFFSET
0,4
LINKS
FORMULA
Sum_{k=n..n*(n+3)/2} (k+1) * T(n,k) = A284231(n).
EXAMPLE
Triangle T(n,k) begins:
1;
. 1, 1;
. . 2, 1, 1, 1;
. . . 4, 4, 4, 7, 3, 1, 1;
. . . . 9, 8, 16, 21, 17, 15, 10, 9, ... ;
. . . . . 21, 22, 54, 87, 87, 116, 99, ... ;
. . . . . . 51, 54, 178, 269, 370, 499, ... ;
. . . . . . . 127, 142, 565, 896, 1473, ... ;
. . . . . . . . 323, 370, 1766, 2776, ... ;
. . . . . . . . . 835, 983, 5446, ... ;
. . . . . . . . . . 2188, 2627, ... ;
CROSSREFS
KEYWORD
nonn,tabf,walk
AUTHOR
Alois P. Heinz, Mar 31 2017
STATUS
approved