249984

Appears in sequences

• Theta series of the coset of the E_7 lattice in its dual.at n=19A005931
• Nonzero coefficients in theta series of {E_7}* lattice.at n=39A030443
• a(n) = (2*n+2)*(2*n+3)*(2*n+4) = 24*A000330(n+1).at n=30A069074
• Numbers n such that uphi(uphi(n)) = n/2.at n=12A071008
• a(n) = (3*n-1) * 3*n * (3*n+1).at n=20A097321
• Number of singly defective permutations of 1..n+8 with exactly 5 maxima.at n=0A183268
• T(n,k) is the number of singly defective permutations of 1..n+2*k-2 with exactly k maxima.at n=10A183270
• Expansion of e.g.f. x/cos(x)*exp(x/cos(x)).at n=8A189238
• Square root of determinant of skew-symmetric 2n X 2n matrix with entries i XOR j for i < j, i=1..2n, j=1..2n.at n=8A359335
• Triangle read by rows: T(n, k) = n! * Sum_{j=0..n-1} binomial(k - 1, j) / (j + 1).at n=41A371685