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A356214
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Number of edge covers in the n-Sierpinski gasket graph.
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1
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OFFSET
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1,1
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LINKS
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PROG
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(PARI) a(n)={my(s=[1, 0, 1, 4]); for(k=2, n, s=vector(4, i, sum(xy=1, 3, sum(xz=1, 3, sum(yz=1, 3, s[1+(i>1)+(xy%2)+(xz%2)]*s[1+(i>2)+(xy\2)+(yz%2)]*s[1+(i>3)+(xz\2)+(yz\2)]))))); s[4]} \\ Christian Sievers, Jul 19 2024
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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