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A165470
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a(0)=1, a(1)=5, a(n)=20*a(n-2)-a(n-1).
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1
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1, 5, 15, 85, 215, 1485, 2815, 26885, 29415, 508285, 80015, 10085685, -8485385, 210199085, -379906785, 4583888485, -12182024185, 103859793885, -347500277585, 2424696155285, -9374701706985, 57868624812685
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