34642

Appears in sequences

• Trajectory of 1 under map n->27n+1 if n odd, n->n/2 if n even.at n=8A033970
• Number of possible 2 X n arrangements of black and white squares that can form two consecutive rows in an n X n crossword puzzle.at n=9A133226
• p-INVERT of (1,0,0,1,0,0,1,0,0,...), where p(S) = (1 - S)(1 + S^2).at n=30A292323