250971

Appears in sequences

• Alkane (or paraffin) numbers l(8,n).at n=33A005995
• Number of reversible strings with n-1 beads of 2 colors. 5 beads are black. String is not palindromic.at n=32A032092
• One half of binomial coefficients C(2*n-4,5).at n=16A053132
• a(n) = lcm(n, n+1, n+2, n+3, n+4) / 60.at n=33A067048
• G.f. satisfies: A(x) = (1 + x*A(x)^2)^3.at n=6A212072
• Number of n-element subsets of [n+5] having an even sum.at n=33A282081
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/5)} a(5*k) * a(n-1-5*k).at n=32A386379
• Number of achiral polyominoes with n heptagonal cells of the hyperbolic regular tiling with Schläfli symbol {7,oo}.at n=13A389563