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A076148
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Let b(1)=x, b(2)=y, k*b(k)=(2k-1)*b(k-1) + 3(k+1)*b(k-2); then b(n)=a(n)*x+c(n)/3*y.
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1, 0, 4, 7, 27, 74, 230, 681, 2053, 6148, 18456, 55355, 166079, 498222, 1494682, 4484029, 13452105, 40356296, 121068908, 363206703, 1089620131, 3268860370, 9806581134, 29419743377, 88259230157, 264777690444, 794333071360
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