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A015503
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a(1)=1, a(n) = sum_{k=1}^{k=n-1} (4^k-1)/3 a(k).
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0
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1, 1, 6, 132, 11352, 3882384, 5303336544, 28966824203328, 632809241545903488, 55296137144764138588416, 19327437631660830304254690816, 27021729207700270170039091739231232
(list; graph; refs; listen; history; internal format)
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