Empirical: a(n) = 4*a(n-1) -5*a(n-2) +2*a(n-3) -2*a(n-4) +2*a(n-5) +5*a(n-6) -8*a(n-7) +6*a(n-8) -8*a(n-9) +5*a(n-10) +2*a(n-11) -2*a(n-12) +2*a(n-13) -5*a(n-14) +4*a(n-15) -a(n-16)
Empirical for n mod 12 = 0: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + 74*n
Empirical for n mod 12 = 1: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + 89*n + (235/18)
Empirical for n mod 12 = 2: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + (142/3)*n + (1000/9)
Empirical for n mod 12 = 3: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + 89*n + (195/2)
Empirical for n mod 12 = 4: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + 74*n + (320/9)
Empirical for n mod 12 = 5: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + (187/3)*n + (1595/18)
Empirical for n mod 12 = 6: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + 74*n
Empirical for n mod 12 = 7: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + 89*n + (2395/18)
Empirical for n mod 12 = 8: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + (142/3)*n + (1000/9)
Empirical for n mod 12 = 9: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + 89*n - (45/2)
Empirical for n mod 12 = 10: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + 74*n + (320/9)
Empirical for n mod 12 = 11: a(n) = n^7 + 7*n^6 + 6*n^5 + (55/2)*n^4 + (415/9)*n^3 - (383/3)*n^2 + (187/3)*n + (3755/18)
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