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A192308
1-sequence of reduction of (3n) by x^2 -> x+1.
1
0, 6, 15, 39, 84, 174, 342, 654, 1221, 2241, 4056, 7260, 12876, 22662, 39627, 68907, 119244, 205482, 352770, 603630, 1029825, 1752261, 2974320, 5037624, 8515224, 14367174, 24200007, 40699119, 68348676, 114629286
OFFSET
1,2
COMMENTS
See A192232 for definition of "k-sequence of reduction of [sequence] by [substitution]".
FORMULA
a(n) = 3*A122491(n+1).
G.f.: 3*x^2*(2-x)/(1-x)/(1-x-x^2)^2. [Colin Barker, Feb 11 2012]
MATHEMATICA
(See A192307.)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jun 27 2011
STATUS
approved