71196

Appears in sequences

• G.f.: Sum_{n>=0} [Sum_{k=0..n} C(n,k)^2*x^k]^3 * x^n.at n=8A183146
• Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 4.at n=37A245144
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n) + 1, where a(0) = 1, a(1) = 4, b(0) = 2, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=19A295957
• Number of nX3 0..1 arrays with every element equal to 1, 2 or 3 king-move adjacent elements, with upper left element zero.at n=9A297818
• a(n) is the hafnian of the 2n X 2n symmetric matrix defined by M[i,j] = ceiling(i*j/3).at n=4A358162