Number of different (by numeric value, not by structure) expressions, consisting of N symbols, each of them is one of: nullary 1, unary sqrt(), binary +.
A158415
Number of different (by numeric value, not by structure) expressions, consisting of N symbols, each of them is one of: nullary 1, unary sqrt(), binary +.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =8a(6) =13a(7) =20a(8) =33a(9) =54a(10) =91a(11) =154a(12) =264a(13) =455a(14) =791a(15) =1379a(16) =2424a(17) =4277a(18) =7588a(19) =13513a(20) =24162a(21) =43336a(22) =77978a(23) =140683a(24) =254487a(25) =461409a(26) =838433a(27) =1526536
External references
- oeis: A158415