1676505600

Appears in sequences

• Bishops on an n X n board (see Robinson paper for details).at n=23A005633
• Number of labeled planar binary trees with 2n-1 elements (external nodes or internal nodes).at n=5A052510
• Expansion of e.g.f. 1/((1-x)^2*(1-x^2)).at n=11A052618
• Nonzero coefficients of the polynomials in the numerator of 1/(1+x^2) and its successive derivatives, starting with the highest power of x.at n=32A076743
• A coefficient tree from the list partition transform relating A000129, A000142, A000165, A110327, and A110330.at n=32A131980
• Number of runs of even entries in all permutations of {1,2,...,n} (the permutation 274831659 has 3 runs of even entries: 2, 48 and 6).at n=10A152668
• Number of permutations of [n] starting and ending with an odd number.at n=13A199495
• Table: T(n,k) = n!*binomial(n+1,2*k).at n=38A228955
• a(n) = ((1+n)*floor(1+n/2))*(n!/floor(1+n/2)!)^2.at n=10A329965