Empirical: a(n) = 3*a(n-2) +2*a(n-3) -2*a(n-4) -6*a(n-5) -3*a(n-6) +4*a(n-7) +6*a(n-8) +4*a(n-9) -3*a(n-10) -6*a(n-11) -2*a(n-12) +2*a(n-13) +3*a(n-14) -a(n-16)
Empirical for n mod 12 = 0: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (4450/9)*n^3 - (13225/24)*n^2 + (467/6)*n + 1
Empirical for n mod 12 = 1: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (68545/144)*n^3 - (21725/48)*n^2 - (25423/96)*n + (115843/288)
Empirical for n mod 12 = 2: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (4450/9)*n^3 - (13225/24)*n^2 + (49/2)*n + (2269/9)
Empirical for n mod 12 = 3: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (68545/144)*n^3 - (21725/48)*n^2 - (25423/96)*n + (17067/32)
Empirical for n mod 12 = 4: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (4450/9)*n^3 - (13225/24)*n^2 + (467/6)*n - (631/9)
Empirical for n mod 12 = 5: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (68545/144)*n^3 - (21725/48)*n^2 - (10181/32)*n + (214403/288)
Empirical for n mod 12 = 6: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (4450/9)*n^3 - (13225/24)*n^2 + (467/6)*n - 19
Empirical for n mod 12 = 7: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (68545/144)*n^3 - (21725/48)*n^2 - (25423/96)*n + (133123/288)
Empirical for n mod 12 = 8: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (4450/9)*n^3 - (13225/24)*n^2 + (49/2)*n + (2449/9)
Empirical for n mod 12 = 9: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (68545/144)*n^3 - (21725/48)*n^2 - (25423/96)*n + (15147/32)
Empirical for n mod 12 = 10: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (4450/9)*n^3 - (13225/24)*n^2 + (467/6)*n - (811/9)
Empirical for n mod 12 = 11: a(n) = (1043/32)*n^5 - (5165/32)*n^4 + (68545/144)*n^3 - (21725/48)*n^2 - (10181/32)*n + (231683/288)
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