A267183 Row 3 of the square array in A267181.

1, 3, 4, 0, 4, 5, 1, 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, 27, 28, 24, 28, 29, 25, 29, 30

Offset

0,2

Links

Table of n, a(n) for n=0..80.

Formula

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

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

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

Crossrefs

Cf. A267181.

Sequence in context: A220956 A294967 A351045 * A021750 A246770 A197809

Adjacent sequences: A267180 A267181 A267182 * A267184 A267185 A267186

Keyword

nonn

Author

N. J. A. Sloane, Jan 17 2016

Status

approved