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A087944
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Expansion of (1-4*x+3*x^2)/((1-2*x)*(1-4*x+x^2)).
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4
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1, 2, 6, 20, 70, 252, 922, 3404, 12630, 46988, 175066, 652764, 2434966, 9085052, 33901146, 126511340, 472127830, 1761967212, 6575675482, 24540603644, 91586476950, 341804779868, 1275631593946, 4760719498764, 17767242206806
(list; graph; refs; listen; history; internal format)
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