19062500

Appears in sequences

• Kekulé numbers for certain benzenoids.at n=6A114480
• Number of zig-zag paths from top to bottom of a rectangle of width 9 with n rows whose color is not that of the top right corner.at n=24A153364
• Number of zig-zag paths from top to bottom of a rectangle of width 9 with 2n-1 rows whose color is not that of the top right corner.at n=12A153367