Empirical: a(n) = 3*a(n-1) -3*a(n-2) +2*a(n-3) -2*a(n-4) +a(n-5) -a(n-6) +a(n-7) +a(n-8) -a(n-9) +a(n-10) -2*a(n-11) +2*a(n-12) -3*a(n-13) +3*a(n-14) -a(n-15)
Empirical for n mod 60 = 0: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n + 1
Empirical for n mod 60 = 1: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n - (487/60)
Empirical for n mod 60 = 2: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n + (139/15)
Empirical for n mod 60 = 3: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n + (203/20)
Empirical for n mod 60 = 4: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n - (457/15)
Empirical for n mod 60 = 5: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n + (437/12)
Empirical for n mod 60 = 6: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n - (151/5)
Empirical for n mod 60 = 7: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n + (881/60)
Empirical for n mod 60 = 8: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n - (329/15)
Empirical for n mod 60 = 9: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n + (899/20)
Empirical for n mod 60 = 10: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n - (77/3)
Empirical for n mod 60 = 11: a(n) = (6/5)*n^5 + (9/4)*n^4 + (11/3)*n^3 + 2*n^2 + n - (1487/60)
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