917507

Appears in sequences

• a(n) = n*x^n + (n-1)*x^(n-1) + . . . + x + 1 for x=2.at n=15A088578
• a(n) = 7*2^n + 3.at n=17A164285
• Number of cliques in the n-Sierpinski tetrahedron graph.at n=8A292537