199617

Appears in sequences

• a(n) is the constant term in expansion of Product_{k=1..n} (x^(k*(k+1)/2) + 1 + 1/x^(k*(k+1)/2)).at n=17A369344
• a(n) is the number of 5 element sets of distinct integer sided strict rectangles that fill an n X n square.at n=26A387605