259920

Appears in sequences

• Number of domino tilings of a 3-pillow of order n.at n=7A112833
• a(n) = number of finite sequences using numbers drawn from (1,2,3,...,n), using each number at most once, where each number in a finite sequence is not coprime to the previous number, and each finite sequence must continued if possible. (See example.)at n=14A175303
• Numbers n such that n+k-1 is the sum of two nonzero squares in exactly k ways for all k = 1, 2, 3.at n=10A273318