a(1) = greatest k such that H(k) - H(8) < H(8) - H(4); a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(8), and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.
A227804
a(1) = greatest k such that H(k) - H(8) < H(8) - H(4); a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(8), and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.
Terms
- a(0) =15a(1) =27a(2) =48a(3) =85a(4) =150a(5) =264a(6) =464a(7) =815a(8) =1431a(9) =2512a(10) =4409a(11) =7738a(12) =13580a(13) =23832a(14) =41823a(15) =73395a(16) =128800a(17) =226029a(18) =396654a(19) =696080a(20) =1221536a(21) =2143647a(22) =3761839a(23) =6601568a(24) =11584945a(25) =20330162a(26) =35676948a(27) =62608680a(28) =109870575a(29) =192809419
External references
- oeis: A227804