Length of lists created by n substitutions k -> Range[k+1,1,-3] starting with {1}, counting down from k+1 to 1 step -3.

A084080

Length of lists created by n substitutions k -> Range[k+1,1,-3] starting with {1}, counting down from k+1 to 1 step -3.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =9a(7) =15a(8) =22a(9) =52a(10) =91a(11) =140a(12) =340a(13) =612a(14) =969a(15) =2394a(16) =4389a(17) =7084a(18) =17710a(19) =32890a(20) =53820a(21) =135720a(22) =254475a(23) =420732a(24) =1068012a(25) =2017356a(26) =3362260a(27) =8579560a(28) =16301164a(29) =27343888

External references