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A068533
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a(n)=(11^(2^n)-1)/2^(n+2)/15.
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0
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1, 61, 446581, 47864301941221, 1099675872153778794555007944901, 1160915542845287082257685451398396234242229540362376748831753861, 2587631803429953767431812922335511171298614788064511166728057883038770884444505265048062877435638536484571643805442456022573810181
(list; graph; refs; listen; history; internal format)
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