The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 4,3 LINKS Andrew Howroyd, Table of n, a(n) for n = 4..1278 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. Cf. A059678, A059679, A059681, A059684. Sequence in context: A307163 A254526 A156390 * A307170 A332053 A225951 Adjacent sequences:  A059677 A059678 A059679 * A059681 A059682 A059683 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 24 04:42 EDT 2020. Contains 337317 sequences. (Running on oeis4.)