20412

Appears in sequences

• a(n) = 3^n + n^3.at n=9A001585
• Theta series of 12-dimensional Coxeter-Todd lattice K_12.at n=4A004010
• Cubes written in base 6.at n=13A004636
• Coordination sequence for sigma-CrFe, Position Xf.at n=36A009958
• a(n) = n^2*(n+1).at n=27A011379
• Triangle of coefficients in expansion of (1+3*x)^n.at n=42A013610
• Triangle of coefficients in expansion of (2+3x)^n.at n=33A013620
• Expansion of (1/theta_4 - 1)/2.at n=26A014968
• Cube of lower triangular normalized binomial matrix.at n=38A027465
• Third convolution of the powers of 3 (A000244).at n=6A027472
• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*2^j.at n=30A038220
• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*4^j.at n=29A038222
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*3^j.at n=34A038233
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*9^j.at n=13A038275
• Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*7^j.at n=11A038297
• Sums of 2 distinct powers of 3.at n=42A038464
• Iterated procedure 'composite k added to sum of its prime factors reaches a prime' yields 1 skipped prime.at n=12A050768
• Number of primitive (aperiodic) reversible strings with n beads using exactly four different colors.at n=7A056320
• Growth series for fundamental group of orientable closed surface of genus 7.at n=3A063817
• Numbers k such that sopf(k) = d(k) where d(k) = A001223(k) and sopf(k) = A008472(k).at n=33A064010