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A050147
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a(n) = T(n,n-1), array T as in A050143. Also T(2n+1,n), array T as in A055807.
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2
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1, 3, 12, 56, 280, 1452, 7700, 41456, 225648, 1238420, 6840988, 37986984, 211842696, 1185635388, 6655993380, 37463920608, 211350457824, 1194706644516, 6765300359468, 38370431711000, 217931108199672
(list; graph; refs; listen; history; internal format)
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