54187

Appears in sequences

• Row sums of a triangle related to the Jacobsthal polynomials.at n=17A108742
• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having k cells in the second column (n>=1, k>=0). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=39A121581
• The (1,4)-entry in the matrix M^n, where M is the 4 X 4 matrix {{0, -1, -1, 1}, {1, -1, 0, 0}, {0, 1, 1, 0}, {0, 0, 1, 1 }}.at n=39A122789
• a(n) = Sum_{k=1..n} k^2*tau(k), where tau is A000005.at n=32A319085