28178

Appears in sequences

• Number of collinear triples in a 3 X n rectangular grid.at n=39A057566
• Number of partitions of 2^n into powers of n.at n=13A196889
• Meandric numbers for a river crossing any number of parallel roads at n points.at n=12A206432
• Meandric numbers for a river crossing up to 12 parallel roads at n points.at n=12A209656
• Meandric numbers for a river crossing up to 13 parallel roads at n points.at n=12A209657
• Meandric numbers for a river crossing up to 14 parallel roads at n points.at n=12A209660
• Meandric numbers for a river crossing up to 15 parallel roads at n points.at n=12A209707
• Meandric numbers for a river crossing up to 16 parallel roads at n points.at n=12A210344
• Meandric numbers for a river crossing up to 17 parallel roads at n points.at n=12A210478
• Meandric numbers for a river crossing up to 18 parallel roads at n points.at n=12A210567
• Meandric numbers for a river crossing up to 19 parallel roads at n points.at n=12A210592
• a(n) = sum of absolute values of coefficients of a certain polynomial P_n(x) arising in the enumeration of tatami mat coverings.at n=17A226303
• a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(n-1-k,k) * binomial(2*n-4*k,n-2*k).at n=9A360293