73812

Appears in sequences

• Triangle read by rows where the n-th row is the first row of M^n, with M the (n+1)-by-(n+1) matrix with (3,1,3,1,3,1,...) on its main diagonal and (1,3,1,3,1,3,...) on its superdiagonal.at n=47A124573
• a(n) = 2*a(n-1) + 3*a(n-2), with a(0) = 2 and a(1) = 3.at n=10A135522
• a(n+1) = 9*a(n) - 6, a(0) = 2.at n=5A137483
• Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 4,3 4,4 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155310
• Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=13A253431
• Number of (4+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=13A253438
• Square array: A(row,col) = A003602(A254051(row,col)), read by antidiagonals A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...at n=76A254055
• Total path length of the complete ternary tree of height n.at n=8A289399