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 A220129 1 followed by period 12: (1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1, 11) repeated; offset 0. 2
 1, 1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1, 11, 1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1, 11, 1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1, 11, 1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1, 11, 1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1, 11, 1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1, 11, 1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1, 11 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Also the number of tilings of an n X 4 rectangle using integer-sided rectangular tiles of area n. LINKS Alois P. Heinz, Table of n, a(n) for n = 0..1000 FORMULA G.f.: -(10*x^6+11*x^5+16*x^4+9*x^3+7*x^2+2*x+1) / (x^6+x^5+x^4-x^2-x-1). EXAMPLE a(6) = 7, because there are 7 tilings of a 6 X 4 rectangle using integer-sided rectangular tiles of area 6: ._._._._.  ._._._._.  ._._____.  .___._._. | | | | |  |     | |  | |     |  |   | | | | | | | |  |_____| |  | |_____|  |   | | | | | | | |  |     | |  | |     |  |___| | | | | | | |  |_____| |  | |_____|  |   | | | | | | | |  |     | |  | |     |  |   | | | |_|_|_|_|  |_____|_|  |_|_____|  |___|_|_| ._.___._.  ._._.___.  .___.___. | |   | |  | | |   |  |   |   | | |   | |  | | |   |  |   |   | | |___| |  | | |___|  |___|___| | |   | |  | | |   |  |   |   | | |   | |  | | |   |  |   |   | |_|___|_|  |_|_|___|  |___|___| MAPLE a:= n-> `if`(n=0, 1, [11, 1, 5, 3, 9, 1, 7, 1, 9, 3, 5, 1][irem(n, 12)+1]): seq(a(n), n=0..100); CROSSREFS Row n=4 of A220122. Sequence in context: A092748 A078302 A199438 * A192039 A305327 A112812 Adjacent sequences:  A220126 A220127 A220128 * A220130 A220131 A220132 KEYWORD nonn,easy AUTHOR Alois P. Heinz, Dec 06 2012 STATUS approved

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Last modified September 24 12:31 EDT 2021. Contains 347642 sequences. (Running on oeis4.)