19335

Appears in sequences

• Crystal ball sequence for diamond.at n=28A007904
• a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1 and a(3)=3.at n=17A024725
• Start of the first run of exactly n consecutive odd composite numbers.at n=18A075067
• Poincaré series [or Poincare series] (or Molien series) for a certain four-fold wreath product P_4.at n=50A091434
• Number of (n+2) X 6 0..2 matrices with each 3 X 3 subblock idempotent.at n=13A224602
• Number of n-step tri-directional self-avoiding walks on the hexagonal lattice.at n=11A272265
• Number of locally stable rooted trees with n nodes, meaning no branch is a submultiset of any other (unequal) branch of the same root.at n=16A316475
• Number of Ulam numbers u (A002858) between powers of 2, 2^n < u <= 2^(n+1).at n=18A331729