A267186 Column 3 of the square array in A267181.

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

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: A307865 A219695 A364575 * A248092 A145105 A140700

Adjacent sequences: A267183 A267184 A267185 * A267187 A267188 A267189

Keyword

nonn

Author

N. J. A. Sloane, Jan 17 2016

Status

approved