Running time of Takeuchi function.

Terms

a(0) =0a(1) =1a(2) =4a(3) =14a(4) =53a(5) =223a(6) =1034a(7) =5221a(8) =28437a(9) =165859a(10) =1029803a(11) =6772850a(12) =46983238a(13) =342509396a(14) =2615606677a(15) =20865444825a(16) =173446634597