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A238555 Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 7 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=3*floor(n/2), read by rows. 21
1, 3, 6, 2, 1, 3, 12, 8, 1, 6, 34, 68, 72, 30, 6, 1, 6, 58, 206, 403, 336, 106, 1, 9, 98, 509, 1551, 2505, 2196, 971, 219, 20, 1, 9, 140, 980, 4248, 10592, 15614, 12876, 5462, 900, 1, 12, 198, 1742, 9748, 33644, 73274, 98779, 80661, 37886, 9679, 1258, 72 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 2..953

Christopher Hunt Gribble, C++ program

EXAMPLE

The first 6 rows of T(n,k) are:

./ k 0 1 2 3 4 5 6 7 8 9

n

2 1 3 6 2

3 1 3 12 8

4 1 6 34 68 72 30 6

5 1 6 58 206 403 336 106

6 1 9 98 509 1551 2505 2196 971 219 20

7 1 9 140 980 4248 10592 15614 12876 5462 900

PROG

(C++) See Gribble link.

CROSSREFS

Cf. A034851, A226048, A102541, A226290, A238009, A228570, A225812, A238189, A238190, A228572, A228022, A231145, A231473, A231568, A232440, A228165, A238550, A238551, A238552, A228166, A238556, A228167, A238557, A238558, A238559, A228168, A238581, A238582, A238583, A228169, A238586, A238592.

Sequence in context: A058178 A058078 A016551 * A176034 A255051 A145896

Adjacent sequences: A238552 A238553 A238554 * A238556 A238557 A238558

KEYWORD

tabf,nonn

AUTHOR

Christopher Hunt Gribble, Feb 28 2014

EXTENSIONS

Terms corrected and xrefs updated by Christopher Hunt Gribble, Apr 27 2015

STATUS

approved

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Last modified February 5 23:07 EST 2023. Contains 360091 sequences. (Running on oeis4.)