47745domain: NAppears in sequencesa(n) = 324*n^2 - 564*n + 321 (n>=1).at n=12A304617a(n) = (4*n^3 + 12*n^2 - 4*n + 3)/3.at n=32A322594Numbers with five neighboring primes on the hexagonal spiral board of odd numbers.at n=27A345654Expansion of e.g.f. 1/(4 - 3*exp(x))^(x/2).at n=6A367487