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A301689
Partial sums of A301688.
1
1, 5, 14, 26, 43, 65, 89, 119, 154, 190, 233, 281, 329, 385, 446, 506, 575, 649, 721, 803, 890, 974, 1069, 1169, 1265, 1373, 1486, 1594, 1715, 1841, 1961, 2095, 2234, 2366, 2513, 2665, 2809, 2969, 3134, 3290, 3463, 3641, 3809, 3995, 4186, 4366, 4565, 4769, 4961, 5173, 5390, 5594, 5819, 6049, 6265, 6503, 6746, 6974
OFFSET
0,2
COMMENTS
Linear recurrence and g.f. confirmed by Shutov/Maleev link in A301688. - Ray Chandler, Aug 30 2023
FORMULA
From Chai Wah Wu, Feb 03 2021: (Start)
a(n) = a(n-1) + 2*a(n-3) - 2*a(n-4) - a(n-6) + a(n-7) for n > 6.
G.f.: (-x^6 - 4*x^5 - 9*x^4 - 10*x^3 - 9*x^2 - 4*x - 1)/((x - 1)^3*(x^2 + x + 1)^2). (End)
CROSSREFS
Cf. A301688.
Sequence in context: A246517 A306886 A202821 * A367690 A066479 A080390
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 25 2018
STATUS
approved