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 A234931 Number of tilings of a 5 X n rectangle using n pentominoes of shapes F, U, N. 11
 1, 0, 0, 0, 2, 0, 0, 0, 4, 0, 8, 0, 16, 0, 40, 0, 64, 16, 200, 96, 504, 464, 1528, 1664, 4376, 5616, 12792, 18192, 38264, 58384, 115832, 186368, 355808, 589344, 1095408, 1853664, 3383656, 5802016, 10470376, 18125280, 32461312, 56552736, 100782696, 176318464 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..1000 Wikipedia, Pentomino FORMULA G.f.: (4*x^20 +4*x^18 +8*x^16 -3*x^14 +4*x^13 -5*x^12 -2*x^11 +3*x^10 -2*x^9 +6*x^8 -2*x^7 +2*x^6 -2*x^5 -x^4 +2*x -1) / (-8*x^22 -28*x^20 -6*x^18 +8*x^17 +26*x^16 +4*x^15 +7*x^14 -8*x^13 -9*x^12 -14*x^11 +7*x^10 +2*x^9 +8*x^8 -2*x^7 +2*x^6 -6*x^5 +x^4 +2*x -1). EXAMPLE a(4) = 2: ._______.   ._______. | | ._. |   | ._. | | | |_| |_|   |_| |_| | |_. |_. |   | ._| ._| | |_| | |   | | |_| | |_____|_|   |_|_____|. CROSSREFS Cf. A174249, A233427, A234312, A247680, A247126. Sequence in context: A285182 A190608 A011991 * A129183 A280292 A181566 Adjacent sequences:  A234928 A234929 A234930 * A234932 A234933 A234934 KEYWORD nonn AUTHOR Alois P. Heinz, Jan 01 2014 STATUS approved

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Last modified January 16 04:24 EST 2021. Contains 340195 sequences. (Running on oeis4.)