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1, 6, 16, 32, 54, 81, 113, 150, 192, 240, 294, 353, 417, 486, 560, 640, 726, 817, 913, 1014, 1120, 1232, 1350, 1473, 1601, 1734, 1872, 2016, 2166, 2321, 2481, 2646, 2816, 2992, 3174, 3361, 3553, 3750, 3952, 4160, 4374, 4593, 4817, 5046, 5280, 5520, 5766, 6017, 6273, 6534, 6800, 7072, 7350, 7633, 7921, 8214, 8512, 8816, 9126, 9441, 9761
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OFFSET
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0,2
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COMMENTS
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Linear recurrence and g.f. confirmed by Shutov/Maleev link in A301697. - Ray Chandler, Aug 30 2023
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LINKS
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FORMULA
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G.f.: (1 + 3*x + 2*x^2 + 4*x^3 + 2*x^4 + 3*x^5 + x^6) / ((1 - x)^3*(1 - x + x^2)*(1 + x + x^2)).
a(n) = 3*a(n-1) - 4*a(n-2) + 4*a(n-3) - 4*a(n-4) + 4*a(n-5) - 3*a(n-6) + a(n-7) for n>6.
(End)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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