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A194511
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Second coordinate of (2,5)-Lagrange pair for n.
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3
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-1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 1, 2, 1, 2, 1, 2, 3, 2, 3, 2, 3, 2, 3, 4, 3, 4, 3, 4, 3, 4, 5, 4, 5, 4, 5, 4, 5, 6, 5, 6, 5, 6, 5, 6, 7, 6, 7, 6, 7, 6, 7, 8, 7, 8, 7, 8, 7, 8, 9, 8, 9, 8, 9, 8, 9, 10, 9, 10, 9, 10, 9, 10, 11, 10, 11, 10, 11, 10, 11, 12, 11, 12, 11, 12, 11, 12, 13, 12, 13
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OFFSET
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1,10
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COMMENTS
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LINKS
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FORMULA
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a(n) = a(n-1) + a(n-7) - a(n-8) for n > 8.
G.f.: x*(x^6 - x^5 + x^4 - x^3 + x^2 + x - 1)/(x^8 - x^7 - x + 1). (End)
G.f.: x*(1-x^2+x^3)*(x^3+x-1)/((1-x)^2*(1+x+x^2+x^3+x^4+x^5+x^6)). - R. J. Mathar, Feb 04 2022
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EXAMPLE
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This table shows (x(n),y(n)) for 1<=n<=13:
n...... 1..2..3..4..5..6..7..8..9..10..11..12..13
x(n)... 3..1.-1..2..0..3..1..4..2..0...3...1...4
y(n).. -1..0..1..0..1..0..1..0..1..2...1...2...1
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MATHEMATICA
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c = 2; d = 5;
x1 = {3, 1, -1, 2, 0, 3, 1}; y1 = {-1, 0, 1, 0, 1, 0, 1};
x[n_] := If[n <= c + d, x1[[n]], x[n - c - d] + 1]
y[n_] := If[n <= c + d, y1[[n]], y[n - c - d] + 1]
Table[x[n], {n, 1, 100}] (* A194510 *)
Table[y[n], {n, 1, 100}] (* A194511 *)
r[1, n_] := n; r[2, n_] := x[n]; r[3, n_] := y[n]
TableForm[Table[r[m, n], {m, 1, 3}, {n, 1, 30}]]
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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