23460

Appears in sequences

• Number of walks on cubic lattice (starting from origin and not going below xy plane).at n=6A005573
• Rounded value of n*L_n(-1) where L is the Laguerre polynomial.at n=22A070070
• G.f. = continued fraction: A(x)=1/(1-x-x^2-x^3/(1-x^4-x^5-x^6/(1-x^7-x^8-x^9/(...)))).at n=17A088353
• Least area of primitive Pythagorean triangle whose legs differ by A058529(n).at n=31A094143
• Area of the Pythagorean triangle a = u^2 - v^2 (cf. A096382) when u=3, v=4,4,5,...at n=16A096383
• a(n) = area of Pythagorean triangle with hypotenuse p, where p = A002144(n) = n-th prime == 1 (mod 4).at n=38A145010
• Numbers k such that there is 1 prime between 100*k and 100*k + 99.at n=29A186393
• Numbers such that the sum of the largest and the smallest prime divisor equals the sum of the other distinct prime divisors.at n=36A199745
• Number of ways to cut an n X n square into squares with integer sides, reduced for symmetry, where the orbits under the symmetry group of the square, D4, have 4 elements.at n=7A226980
• Partitions with parts repeated at most twice and repetition only allowed if first part has an even index (first index = 1).at n=58A227135
• The hyper-Wiener index of the triangular graph T(n) (n >= 1).at n=16A228317
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. exp(k*x)*(BesselI(0,2*x) + BesselI(1,2*x)).at n=61A292630
• Number of ways to partition the Young diagram of an integer partition of n into vertical sections.at n=8A321737
• Number of strict compositions of n whose non-adjacent parts are strictly decreasing.at n=46A333150
• Number T(n,k) of binary search trees of height k having n internal nodes; triangle T(n,k), k>=0, k<=n<=2^k-1, read by columns.at n=31A335920
• Areas of primitive Pythagorean triangles that are sums of two or more consecutive primes.at n=46A383395
• Unitary s-Zumkeller numbers.at n=38A384515
• G.f.: 1/Product_{k>=1} (1 - x^(2*k^2)) * (1 - x^k).at n=31A385011
• G.f. satisfies A(x) = A(x^2) - A(x^3)/A(-x^2).at n=56A385908