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A072130
a(n+1) -3*a(n) + a(n-1) = (2/3)(1+w^(n+1)+w^(2n+2)); a(1) = 0, a(2) = 1; where w is the imaginary cubic root of unity.
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0, 1, 5, 14, 37, 99, 260, 681, 1785, 4674, 12237, 32039, 83880, 219601, 574925, 1505174, 3940597, 10316619, 27009260, 70711161, 185124225, 484661514, 1268860317, 3321919439, 8696898000, 22768774561, 59609425685, 156059502494
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Maintained by
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
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