506880

Appears in sequences

• Coefficients of x^n in Hermite polynomial H_{n+4}.at n=7A001816
• Embeddings of n-bouquet in sphere.at n=6A005431
• Number of (binary) heaps on n elements.at n=13A056971
• Triangle of nonzero coefficients of Hermite polynomials H_n(x) in increasing powers of x.at n=39A059343
• a(n) = sigma(A067651(n)).at n=21A107816
• Number of rationals in [0, 1) having exactly n preperiodic bits, then exactly n periodic bits.at n=9A119920
• Number of lower triangles of an n X n 0..3 array with new values introduced in row major order 0..3 and no two horizontal or vertical neighbors of any element equal.at n=8A194888
• 2-quantum transitions in systems of N>=2 spin 1/2 particles, in columns by combination indices.at n=31A213344
• 3-quantum transitions in systems of N>=3 spin 1/2 particles, in columns by combination indices.at n=26A213345
• Catalan number analogs for totienomial coefficients (A238453).at n=13A245798
• Square array read by antidiagonals downwards: super Patalan numbers of order 4.at n=32A248325
• T(n, k) = Sum_{j=0..k} (-1)^j*binomial(2*k, j)*(k - j)^(2*n), triangle read by rows, n >= 0 and 0 <= k <= n.at n=24A304330
• Triangle read by rows: T(n,k) is the number of preimages of the permutation 21345...n under West's stack-sorting map that have k+1 valleys (1 <= k <= floor((n-1)/2)).at n=38A317555
• Number of subsets of {1..n} such that no two elements have the same sorted prime signature.at n=36A326438