A267187 Column 4 of the square array in A267181.

0, 3, 1, 4, 0, 6, 4, 7, 2, 7, 5, 8, 3, 8, 6, 9, 4, 9, 7, 10, 5, 10, 8, 11, 6, 11, 9, 12, 7, 12, 10, 13, 8, 13, 11, 14, 9, 14, 12, 15, 10, 15, 13, 16, 11, 16, 14, 17, 12, 17, 15, 18, 13, 18, 16, 19, 14, 19, 17, 20, 15, 20, 18, 21, 16, 21, 19, 22, 17, 22, 20, 23

Offset

0,2

Links

Table of n, a(n) for n=0..71.

Formula

Conjectures from Colin Barker, Jan 29 2016: (Start)

a(n) = a(n-1)+a(n-4)-a(n-5) for n>5.

G.f.: x*(3-2*x+3*x^2-4*x^3+3*x^4-x^7-x^8) / ((1-x)^2*(1+x)*(1+x^2)).

(End)

Crossrefs

Cf. A267181.

Sequence in context: A130540 A076816 A021765 * A274716 A245434 A305100

Adjacent sequences: A267184 A267185 A267186 * A267188 A267189 A267190

Keyword

nonn

Author

N. J. A. Sloane, Jan 17 2016

Status

approved