38207

Appears in sequences

• a(n) = floor((x^n - (1-x)^n) / (2x-1) +.5) where x = (sqrt(6)+1)/2 (and hence 2x-1 = sqrt(6)).at n=20A136424
• Partial sums of A030001, starting at n=1.at n=9A176761
• Number of n X 7 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=3A207937
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=48A207938
• Number of 4Xn 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=6A207940
• Number of 3 X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.at n=31A239987
• Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 7.at n=54A245147
• Number of nonagons that can be formed with perimeter n.at n=49A288255
• Number of free pure symmetric identity multifunctions (with empty expressions allowed) with one atom and n positions.at n=12A317876
• Triangle read by rows: T(n,k) is the number of simple graphs on n unlabeled nodes with irredundance number k.at n=38A332404