129781

Appears in sequences

• 9800*n^2-5740*n-4059.at n=3A118061
• Floor[1/{(3+n^4)^(1/4)}], where {}=fractional part.at n=45A184538
• The number of permutations of length n sortable by 2 prefix block transpositions.at n=27A228394
• Sequence a(n) = 3*A002559(n) - 2 determining the principal reduced indefinite binary quadratic form [1, a(n), -a(n)] for Markoff triples.at n=26A324250