71928

Appears in sequences

• Triangle T(n,k) read by rows, arising in enumeration of catafusenes.at n=62A024462
• Partial sums of n 3-spaced triangular numbers beginning with t(2), e.g., a(2) = t(2) + t(5) = 3 + 15 = 18.at n=35A085789
• Numbers k divisible by at least one nontrivial permutation (rearrangement) of the digits of k, excluding all permutations that result in digit loss.at n=18A090056
• First differences of A140495.at n=43A142716
• a(n) = 6*n^2*(2*n + 1).at n=18A190705
• Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically.at n=4A207465
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically.at n=49A207467
• Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically.at n=5A207469
• Number of (w,x,y,z) with all terms in {1,...,n} and w>2x and y>=3z.at n=37A212519
• Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|=|y-z|+1.at n=37A212680
• a(n) is the smallest even k >= 2 such that the first n multiples of k have the same sum of digits, but (n + 1)*k has a different one. a(n) = 0 if no such k exists.at n=29A237994
• Number of partitions of 7n into exactly 4 parts.at n=31A256329
• Trapezoidal matrix T(n,k) (n>=1, 1<=k<=n+2) read by rows, arising in enumeration of unbranched k-4-catafusenes.at n=55A323943
• Dirichlet g.f.: Product_{k>=2} (1 + k^(-s))^(k^4).at n=11A343324