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A151631
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Number of permutations of 2 indistinguishable copies of 1..n with exactly 9 adjacent element pairs in decreasing order.
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2
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0, 0, 0, 0, 0, 716, 6030140, 6727188848, 2898916824320, 713977455470200, 121976270685699352, 16151017610840330800, 1776999565259831468176, 170177528415687895764196, 14652450038892876986833140, 1161079239300986084649361440, 86154881092488160155801056400
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