A192312 1-sequence of reduction of (3n-2) by x^2 -> x+1.

0, 4, 11, 31, 70, 150, 302, 588, 1113, 2065, 3770, 6796, 12124, 21444, 37655, 65715, 114078, 197122, 339242, 581740, 994405, 1694949, 2881586, 4887576, 8272440, 13974340, 23564387, 39670663, 66684598, 111936750

Offset

1,2

Comments

1

Links

Table of n, a(n) for n=1..30.

Formula

Empirical G.f.: x^2*(4-x+2*x^2)/(1-x)/(1-x-x^2)^2. [Colin Barker, Feb 11 2012]

Mathematica

(See A192311.)

Crossrefs

Cf. A192232, A192311.

Sequence in context: A183121 A104743 A165993 * A004080 A298300 A027115

Adjacent sequences: A192309 A192310 A192311 * A192313 A192314 A192315

Keyword

nonn

Author

Clark Kimberling, Jun 27 2011

Status

approved