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A083331
a(n) = (3*5^n - 2*4^n + 3^n)/2.
1
1, 5, 26, 137, 722, 3785, 19706, 101897, 523682, 2677385, 13629386, 69136457, 349699442, 1764742985, 8889229466, 44709799817, 224608392002, 1127293880585, 5653520131946, 28335932715977, 141953379225362, 710862920970185
OFFSET
0,2
COMMENTS
Binomial transform of A083330.
FORMULA
a(n) = (3*5^n - 2*4^n + 3^n)/2.
G.f.: (1-7x+13x^2)/(2(1-3x)(1-4x)(1-5x)).
E.g.f.: (3*exp(5x) - 2*exp(4x) + exp(3x))/2.
CROSSREFS
Sequence in context: A255815 A018903 A355361 * A076025 A288785 A161731
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 27 2003
STATUS
approved