661355087

Appears in sequences

• 1/4 the number of (n+1) X 5 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.at n=5A184599
• 1/4 the number of (n+1) X 7 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.at n=3A184601