20944

Appears in sequences

• Number of nonaveraging subsets on {1,2,...,n}.at n=20A051013
• a(n) = (3*n+5)!!!/5!!!.at n=4A051605
• a(n) = n*(n+1)*(n+2)*(n+3)*(3*n+2)/120.at n=14A051836
• Numbers k such that reverse(gpf(k)) = gpf(k+1), where gpf(n) = A006530(n); a(1)=1.at n=30A071844
• Convoluted convolved Fibonacci numbers G_6^(r).at n=32A089111
• Structured rhombic triacontahedral numbers (vertex structure 11).at n=13A100164
• An invertible triangle of ratios of triple factorials.at n=23A112333
• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n having k LD's (n>=0; 0<=k<=floor((n-1)/2)).at n=21A128733
• a(n) = A000041(n) * A000070(n).at n=12A143229
• Number of ways to place 3 nonattacking kings on a 3 X n board.at n=18A172202
• Number of right isosceles triangles that can be formed from the n^2 points of n X n grid of points (or geoboard).at n=14A187452
• Denominators a(n) of Pythagorean approximations b(n)/a(n) to 3/5.at n=7A195577
• Number of 2 X 2 matrices having all terms in {1,...,n} and determinant in the closed interval [0,n].at n=22A211057
• Sequence of coefficients of x^1 in marked mesh pattern generating function Q_{n,132}^(0,4,0,0)(x).at n=15A212347
• Number of 0..5 arrays of length n with each element differing from at least one neighbor by something other than 1.at n=5A221570
• T(n,k)=Number of 0..k arrays of length n with each element differing from at least one neighbor by something other than 1.at n=50A221573
• Number of 0..n arrays of length 6 with each element differing from at least one neighbor by something other than 1.at n=4A221576
• Boustrophedon transform of even numbers.at n=8A231200
• Number of length 1+3 0..n arrays with some pair in every consecutive four terms totalling exactly n.at n=14A245951
• a(n) = n*(n+1)*(n+2)*(n+3)*(n^2+3*n+26)/720.at n=13A257200