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A084776
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a(n) = sum of absolute-valued coefficients of (1+2x-x^2)^n.
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2
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1, 4, 12, 36, 100, 300, 776, 2412, 6304, 19036, 50952, 148896, 393452, 1211444, 3167004, 9672772, 25295248, 76084796, 200590424, 608621376, 1617201648, 4908511140, 12658776540, 38907904188, 102775961200, 310485090044
(list; graph; refs; listen; history; internal format)
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