142001

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 30.at n=17A031618
• Square array, read by antidiagonals, where row n equals the crystal ball sequence for the 2*n-dimensional lattice A_n x A_n.at n=49A143007
• Square array, read by antidiagonals, where row n equals the crystal ball sequence for the 2*n-dimensional lattice A_n x A_n.at n=50A143007
• Crystal ball sequence for the A4 x A4 lattice.at n=5A143010
• Crystal ball sequence for the A_5 x A_5 lattice.at n=4A143011
• a(n) = Sum_{k = 0..n-1} binomial(n,k)*binomial(n-1,k)*binomial(n+k,k)*binomial(n-1+k,k).at n=5A352653