330818

Appears in sequences

• From area of cyclic polygon of 2n + 1 sides.at n=8A000531
• Triangle related to A001700 and A000302 (powers of 4).at n=46A046658
• a(n) = (n/2)*binomial(n-1, floor((n-1)/2)) - 2^(n-2).at n=18A107373
• Let M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n then a(n) is the trace of M(n)^(-9).at n=8A114361
• Infinite square array read by antidiagonals: a(q,n) is the coefficient of z^n in the series expansion of C(z)^q/(1-4z)^(3/2), where C(z) = (1-sqrt(1-4z))/(2z) is the Catalan function (q,n = 0,1,2,...).at n=53A143019
• Riordan matrix (1/(1-4x),(1-sqrt(1-4x))/(2*sqrt(1-4x))).at n=46A188481
• Number of 8 X n binary arrays without the pattern 0 1 diagonally, vertically, antidiagonally or horizontally.at n=19A188559
• a(n) = (-1)^n*(A056040(n+1)*A152271(n)-2^n)/2.at n=18A194590
• Row sums of A296664.at n=17A296663
• Row sums of A296662.at n=8A296769