167961

Appears in sequences

• Euler characteristics of polytopes.at n=20A006481
• Expansion of 3*(1+2*x-2*x^2)/((1-x)*(1-6*x^2)).at n=12A026551
• Numbers that are repdigits in base 6.at n=33A048331
• a(n) = binomial(n, 9) + 1.at n=20A115205
• a(n) = 3*(6^n - 1)/5.at n=6A125682
• Number of Dyck n-paths all of whose ascents have lengths equal to 1 (mod 10).at n=20A212390
• Alternating row sums of A257241, Stifel's version of the arithmetical triangle.at n=20A258144
• a(n) = binomial(2*n, n+1) + 1.at n=10A323229
• a(n) = floor(A026532(n)/5).at n=15A329114