299052domain: NAppears in sequencesa(n) = (1/2)*(n^4 + 11*n^3 + 53*n^2 + 97*n + 54).at n=26A129026Odd-indexed terms of A129026.at n=13A129027a(n) = floor((sqrt(2) + sqrt(3))^n).at n=11A138281