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A267186 Column 3 of the square array in A267181. 0
0, 2, 3, 0, 5, 6, 2, 6, 7, 3, 7, 8, 4, 8, 9, 5, 9, 10, 6, 10, 11, 7, 11, 12, 8, 12, 13, 9, 13, 14, 10, 14, 15, 11, 15, 16, 12, 16, 17, 13, 17, 18, 14, 18, 19, 15, 19, 20, 16, 20, 21, 17, 21, 22, 18, 22, 23, 19, 23, 24, 20, 24, 25, 21, 25, 26, 22, 26, 27, 23 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..69.

FORMULA

Conjectures from Colin Barker, Jan 30 2016: (Start)

a(n) = a(n-1)+a(n-3)-a(n-4) for n>4.

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

(End)

CROSSREFS

Cf. A267181.

Sequence in context: A128214 A307865 A219695 * A248092 A145105 A140700

Adjacent sequences:  A267183 A267184 A267185 * A267187 A267188 A267189

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 17 2016

STATUS

approved

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Last modified July 12 21:31 EDT 2020. Contains 335669 sequences. (Running on oeis4.)