77788

Appears in sequences

• Numbers which have only digits 7 and 8 in base 10.at n=33A256340
• Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.at n=8A304468
• Draw a regular n-gon and the enclosing circle, then for each pair of vertices X, Y, draw a circle with diameter XY; the union of these figures is the graph H_n; sequence gives number of regions in H_n.at n=26A370978