19650

Appears in sequences

• Expansion of 1/((1+x)(1-x)^8).at n=11A001779
• Number of 3 X n nonnegative integer matrices with all column sums 4, up to row and column permutation.at n=7A058408
• Sums of members of groups in A076063.at n=33A076066
• a(n) = (4*n^3 + 6*n^2 + 8*n + 6)/3.at n=24A100504
• Numbers n such that 3*10^n + 2*R_n + 7 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=15A102968
• a(n) = n*(14*n + 13) + 3.at n=37A195029
• Number of (w,x,y,z) with all terms in {1,...,n} and |w-x|>|x-y|+|y-z|.at n=18A212573
• a(n) is the number of vertices formed by n-secting the angles of a heptagon.at n=43A335758
• Number of 2-linear trees on n nodes.at n=20A338706
• Erroneous version of A338706.at n=20A338710