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A301689 Partial sums of A301688. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..57.

FORMULA

Conjectures 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 * A066479 A080390 A030745

Adjacent sequences:  A301686 A301687 A301688 * A301690 A301691 A301692

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 25 2018

EXTENSIONS

More terms could now be added from A301688. - N. J. A. Sloane, Mar 29 2018

STATUS

approved

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Last modified September 28 14:58 EDT 2021. Contains 347716 sequences. (Running on oeis4.)