A127774 Triangle read by rows: row n consists of n-1 zeros followed by A000292(n).

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

Links

Table of n, a(n) for n=1..67.

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

Cf. A000292, A127648, A127773.

Sequence in context: A364102 A249035 A244121 * A127319 A272626 A271910

Adjacent sequences: A127771 A127772 A127773 * A127775 A127776 A127777

Keyword

nonn,tabl,easy

Author

Gary W. Adamson, Jan 28 2007

Status

approved