97021

Properties

Appears in sequences

• Number of perfect matchings in graph C_{11} X P_{2n}.at n=2A028482
• Number of perfect matchings in the P_4 X C_n graph.at n=8A252054
• G.f.: [ Sum_{n>=0} (4*n)!/(n!)^4 * x^(4*n)/(1-x)^(4*n+4) ]^(1/4).at n=11A262012
• Centered 20-gonal (or icosagonal) primes.at n=23A264845
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Product_{a=1..n} Product_{b=1..k} (4*sin(a*Pi/(2*n+1))^2 + 4*cos(b*Pi/(2*k+1))^2).at n=33A340476
• Prime numbersat n=9340