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A192144
1-sequence of reduction of hexagonal numbers sequence by x^2 -> x+1.
1
0, 6, 21, 77, 212, 542, 1270, 2830, 6043, 12503, 25208, 49772, 96572, 184646, 348641, 651201, 1204908, 2211018, 4027570, 7288750, 13113415, 23468331, 41799216, 74124312, 130925112, 230408262, 404121645, 706605365, 1231946948, 2142132278
OFFSET
1,2
COMMENTS
See A192232 for definition of "k-sequence of reduction of [sequence] by [substitution]".
FORMULA
Empirical G.f.: x^2*(6-3*x+11*x^2-3*x^3)/(1-x)/(1-x-x^2)^3. [Colin Barker, Feb 11 2012]
MATHEMATICA
(See A192143.)
CROSSREFS
Sequence in context: A054625 A192733 A344205 * A026628 A053768 A255719
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jun 27 2011
STATUS
approved