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A022041
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a(n)=3a(n-1)+a(n-2)-a(n-3)+a(n-6)-a(n-7)+a(n-10)-a(n-11).
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1
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2, 6, 19, 61, 196, 630, 2026, 6516, 20957, 67403, 216786, 697242, 2242518, 7212542, 23197478, 74609338, 239963729, 771787993, 2482278087, 7983674995, 25677649398, 82586237418, 265619586324, 854304141280, 2747672247776
(list; graph; refs; listen; history; internal format)
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