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A151527
Number of 2-sided strip polyrects with n cells.
4
1, 2, 3, 6, 12, 26, 57, 130, 297, 694, 1622, 3810, 8966, 21092, 49732, 116952, 275695, 647788, 1525610, 3581170, 8424478, 19757082, 46425561
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Polyrect
CROSSREFS
Sequence in context: A259098 A367386 A166296 * A375099 A086625 A152172
KEYWORD
nonn,hard,more
AUTHOR
Ed Pegg Jr, May 13 2009
EXTENSIONS
a(15)-a(23) from Joseph Myers, Nov 22 2010
STATUS
approved