197676

Appears in sequences

• a(n) = binomial(n,3)*binomial(n-1,3)/4.at n=15A006542
• Number of bracelets (turnover necklaces) of n beads of 2 colors, 7 of them black.at n=32A032280
• Number of 3 X n binary matrices such that any 2 rows have a common 1, up to column permutations.at n=16A052387
• Expansion of (1+x^2*C^2)*C^3, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=10A071722
• Triangle T(n,k) read by rows: permutations on 123...n with one abc pattern and no aj pattern with j<=k, n>2, k<n-1.at n=46A084249
• Triangle T(n, k) = A001263(n*f(n,k) + 1, f(n,k) + 1), where f(n, k) = k if k <= floor(n/2) otherwise n-k, read by rows.at n=24A157243