245348

Appears in sequences

• Binomial transform of Thue-Morse sequence A010060.at n=19A019302
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=3, I={1}.at n=17A080010
• a(n) = 2^(2*n-2) - Catalan(n).at n=9A342906