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A334700
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Triangle read by rows: T(n,k) (n >= 1, 3 <= k <= n+2) = one-quarter of the number of k-sided cells in the n-th figure shown in A255011 (meaning the figure with 4n points on the perimeter).
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3
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1, 12, 2, 51, 28, 6, 170, 96, 14, 0, 415, 268, 112, 19, 2, 854, 598, 100, 14, 0, 0, 1587, 1309, 460, 126, 10, 0, 0
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OFFSET
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1,2
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COMMENTS
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This is the triangle in A334699 with all entries divided by 4.
No formula is known.
For illustrations see A331452.
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LINKS
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Table of n, a(n) for n=1..28.
Scott R. Shannon, Data for triangles A334691 and A334699
Scott R. Shannon, Colored illustration for n = 2
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EXAMPLE
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Triangle begins:
1,
12, 2,
51, 28, 6,
170, 96, 14, 0,
415, 268, 112, 19, 2,
854, 598, 100, 14, 0, 0,
1587, 1309, 460, 126, 10, 0, 0
...
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CROSSREFS
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Cf. A255011, A331452, A331449, A334690, A334691, A334695, A334696, A334699.
Sequence in context: A335043 A040143 A163599 * A007207 A302799 A213059
Adjacent sequences: A334697 A334698 A334699 * A334701 A334702 A334703
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KEYWORD
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nonn,tabf,more
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AUTHOR
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Scott R. Shannon and N. J. A. Sloane, May 18 2020
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STATUS
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approved
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