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A301721 Partial sums of A301720. 0
1, 7, 16, 34, 55, 79, 115, 151, 190, 244, 295, 349, 421, 487, 556, 646, 727, 811, 919, 1015, 1114, 1240, 1351, 1465, 1609, 1735, 1864, 2026, 2167, 2311, 2491, 2647, 2806, 3004, 3175, 3349, 3565, 3751, 3940, 4174, 4375, 4579, 4831, 5047, 5266, 5536, 5767, 6001, 6289, 6535, 6784, 7090, 7351, 7615, 7939, 8215, 8494, 8836 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

FORMULA

Conjectures from Colin Barker, Apr 09 2018: (Start)

G.f.: (1 + 6*x + 9*x^2 + 16*x^3 + 9*x^4 + 6*x^5 + x^6) / ((1 - x)^3*(1 + x + x^2)^2).

a(n) = a(n-1) + 2*a(n-3) - 2*a(n-4) - a(n-6) + a(n-7) for n>6.

(End)

CROSSREFS

Cf. A301720.

Sequence in context: A296153 A190661 A233058 * A176449 A278945 A327628

Adjacent sequences:  A301718 A301719 A301720 * A301722 A301723 A301724

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mar 26 2018

STATUS

approved

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Last modified January 19 12:36 EST 2020. Contains 331049 sequences. (Running on oeis4.)