17980

Appears in sequences

• Conjectured number of irreducible multiple zeta values of depth n and weight 3n (confirmed up to n=7).at n=41A020999
• a(n) = (3*n - 1)*(4*n - 1).at n=39A033578
• a(n) = binomial(2*n,n) mod ((n+1)*(n+2)*(n+3)).at n=27A065345
• Numbers in ascending order formed by using all the digits of the next n numbers.at n=20A081991
• Numbers n such that sigma(n) = 6*phi(n).at n=6A104900
• Number of L-shaped tiles in all tilings of a 2 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).at n=7A127866
• a(n) = a(n-1) - 25*a(n-2), a(0)=1, a(1)=5.at n=8A133667
• Number of permutations in S_n avoiding 1{bar 4}235 (i.e., every occurrence of 1235 is contained in an occurrence of a 14235).at n=8A137535
• Array read by columns: T(n,m) = number of unlabeled graphs with n vertices and m unicyclic components.at n=31A137918
• Numbers of unlabeled graphs with n vertices and 2 unicyclic components.at n=9A138387
• a(n) = 1000*n - 20.at n=17A157515
• Positions of zeros in A165597.at n=24A165598
• Triangle T(n,m) read by rows, obtained from [A(x)]^m = Sum_{n>=m} T(n,m)*x^n, where A(x) (the g.f. for A069271) satisfies 2*x^2*A(x)^3 = 1 - 2*x*A(x) - sqrt(1-4*x*A(x)).at n=73A188108
• Number of nXnXn triangular 0..1 arrays with each element equal to at least two neighbors and with new values 0..1 introduced in row major order.at n=6A192897
• Number of -n..n arrays of 4 elements with zero sum and no two neighbors summing to zero.at n=14A199833
• a(n) = 2*n*(n+1)*(n+2)/3.at n=29A210440
• a(n) = Sum_{i=0..n} digsum_7(i)^4, where digsum_7(i) = A053828(i).at n=24A231679
• Row sums of triangular matrix A246381 = exp(L) where L(n,k) = C(2*n, 2*k+1)/2.at n=6A246385
• 25-gonal numbers: a(n) = n*(23*n-21)/2.at n=40A255184
• Number of length n+4 0..1 arrays with at most one downstep in every n consecutive neighbor pairs.at n=42A255995