325525domain: NAppears in sequencesa(n) = a(n-1) + 4*a(n-2), a(0) = a(1) = 1.at n=14A006131Expansion of 1/(1-x*sqrt(1+4*x^2)).at n=28A190864Number of (n+1)X(2+1) 0..1 arrays x(i,j) with row sums sum{j^4*x(i,j), j=1..2+1} nondecreasing, and column sums sum{i^4*x(i,j), i=1..n+1} nondecreasing.at n=17A232791