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A267183
Row 3 of the square array in A267181.
0
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
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
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 17 2016
STATUS
approved