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A098698
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Main diagonal of array in A098697.
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1
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1, 4, 64, 1778, 73848, 4188592, 306690520, 27893327856, 3063657097664, 397720778283584, 59997757426314624, 10373545999796847232, 2032368096229682220160, 446879795164524710777856
(list; graph; refs; listen; history; internal format)
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