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A127774
Triangle read by rows: row n consists of n-1 zeros followed by A000292(n).
2
1, 0, 4, 0, 0, 10, 0, 0, 0, 20, 0, 0, 0, 0, 35, 0, 0, 0, 0, 0, 56, 0, 0, 0, 0, 0, 0, 84, 0, 0, 0, 0, 0, 0, 0, 120, 0, 0, 0, 0, 0, 0, 0, 0, 165, 0, 0, 0, 0, 0, 0, 0, 0, 0, 220, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 286, 0
OFFSET
1,3
COMMENTS
Essentially triangle T(n,k), read by rows, given by (0,0,0,0,0,0,0,...) DELTA (4,-3/2,5/6,-1/3,3/5,-1/10,1/2,0,0,0,0,0,0,0,...) where DELTA is the operator defined in A084938. - Philippe Deléham, Nov 14 2011
FORMULA
G.f.: 1/((x*y-1)^4). - R. J. Mathar, Aug 12 2015
EXAMPLE
First few rows of the triangle are:
1;
0, 4;
0, 0, 10;
0, 0, 0, 20;
0, 0, 0, 0, 35;
...
CROSSREFS
KEYWORD
nonn,tabl,easy
AUTHOR
Gary W. Adamson, Jan 28 2007
STATUS
approved