login
A059680
Triangle T(n,k) read by rows giving number of fixed 4 X k polyominoes with n cells (n >= 4, 1<=k<=n-3).
6
1, 0, 12, 0, 18, 50, 0, 8, 154, 120, 0, 1, 212, 584, 230, 0, 0, 158, 1396, 1526, 388, 0, 0, 62, 2038, 5154, 3276, 602, 0, 0, 12, 1952, 11328, 14192, 6194, 880, 0, 0, 1, 1232, 17598, 41196, 32824, 10704, 1230, 0, 0, 0, 488, 19912, 87980, 117616, 67284, 17294, 1660
OFFSET
4,3
LINKS
R. C. Read, Contributions to the cell growth problem, Canad. J. Math., 14 (1962), 1-20.
FORMULA
T(n,k) = 0 for n > 4*k. - Andrew Howroyd, Oct 02 2017
EXAMPLE
Triangle starts:
1;
0, 12;
0, 18, 50;
0, 8, 154, 120;
0, 1, 212, 584, 230;
0, 0, 158, 1396, 1526, 388;
0, 0, 62, 2038, 5154, 3276, 602;
0, 0, 12, 1952, 11328, 14192, 6194, 880;
...
CROSSREFS
Column sums are A034187.
Sequence in context: A307163 A254526 A156390 * A307170 A332053 A225951
KEYWORD
nonn,easy,nice,tabl
AUTHOR
N. J. A. Sloane, Feb 05 2001
EXTENSIONS
Terms a(32) and beyond from Andrew Howroyd, Oct 02 2017
STATUS
approved