445380

Appears in sequences

• Indices of pentagonal numbers which are also triangular.at n=6A046174
• a(-1) = a(0) = 0, a(1) = 1; a(n) = 5a(n-1) - 5a(n-2) + a(n-3) + 2*(-1)^(n+1), alternatively a(n) = 3a(n-1) + 3a(n-2) - a(n-3).at n=11A109437
• Number of (n+2) X 6 binary arrays avoiding patterns 001 and 110 in rows and columns.at n=10A202048