272952

Appears in sequences

• a(n) = a(n-1) + a(n-2) + a(n-3) with a(1) = 2, a(2) = 3, a(3) = 4.at n=20A145027
• Number of n X 6 binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.at n=4A228794
• T(n,k)=Number of nXk binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.at n=49A228796
• Number of 5Xn binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.at n=5A228800