4570909

Appears in sequences

• a(1)=1; a(2)=2; for n>2, a(n) = a(n-1) + A000217(n-1)*a(n-2).at n=10A166474
• Number of (n+2) X 7 binary arrays avoiding patterns 000 and 101 in rows, columns and nw-to-se diagonals.at n=10A202529