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a(n) is the number of ways to tile, with squares and dominos, dominoes, a 2 X n board with one extra space at the end. Here is the board for n=3:
(MAGMAMagma) I:=[1, 3, 10]; [n le 3 select I[n] else 3*Self(n-1)+Self(n-2)-Self(n-3): n in [1..30]]; // Vincenzo Librandi, Aug 17 2018
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a(n) is the number of ways to tile, with squares and dominos, a 2 X n board with one extra space at the end. Here is the board for n=3,:
From Greg Dresden, Jun 25 2022: (Start)
From _Greg Dresden_, Jun 25 2022 : (Start) a(n) is the number of ways to tile, with squares and dominos, a 2 X n board with one extra space at the end. Here is the board for n=3:,
Here and here is one of the a(3)=32 possible tilings of this board:
From Greg Dresden, Jun 25 2022 : (Start) a(n) is the number of ways to tile, with squares and dominos, a 2 X n board with one extra space at the end. Here is the board for n=3:
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Here is one of the a(3)=32 possible tilings of this board:
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