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A101900
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Column 0 of triangular matrix A101897, in which column k equals column 0 of A101897^(k+1) and where the n-th row sums are zero for n>0.
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4
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1, -1, 1, -2, 5, -17, 71, -357, 2101, -14203, 108609, -927961, 8769087, -90874197, 1025292311, -12516360103, 164433702745, -2313858448075, 34730232119381, -553983478001961, 9359820238735507, -167004393073794933, 3138414712193291915, -61966152586833353847
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OFFSET
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0,4
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COMMENTS
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|a(n)| is the number of n-length permutations avoiding the dotted pattern 23\dot{1}(conjectured). - Michael D. Weiner, Jul 26 2018
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LINKS
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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