281680

Appears in sequences

• Number of tilings of a 4 X 2n rectangle with L tetrominoes.at n=9A084480
• Number of 1X8 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 1 zero-sum 8-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=15A192695