72801

Appears in sequences

• Triangle read by rows: Each row is constructed by forming the partial sums of the previous row, reading from the right and at every third row repeating the final term.at n=47A099961
• Triangle read by rows: T(n,k) = 2 * A011971(n,k) - 1.at n=48A136791
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (1, -1, 0), (1, 1, -1), (1, 1, 1)}.at n=9A149609