1335378

Appears in sequences

• Number of Twopins positions.at n=35A005689
• Diagonal sums of the triangular matrix A190088.at n=13A190090
• p-INVERT of (1,0,1,0,0,0,0,...), where p(S) = (1 - S)(1 + S^2).at n=39A291741
• Expansion of (1 - x - x^3)/((1 - x - x^3)^2 - 4*x^4).at n=20A375279
• a(n) = Sum_{k=0..floor(2*n/3)} binomial(4*n-4*k,2*k).at n=10A375308
• a(n) = Sum_{k=0..floor(n/2)} binomial(4*k,n-2*k).at n=20A375314