Number of sequences of n 2's and 3's with curling number 2, which have the form XY^2 with Y = 2, and which are robust.
A217929
Number of sequences of n 2's and 3's with curling number 2, which have the form XY^2 with Y = 2, and which are robust.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =7a(6) =16a(7) =30a(8) =63a(9) =122a(10) =251a(11) =495a(12) =1003a(13) =1990a(14) =4012a(15) =7992a(16) =16043a(17) =32024a(18) =64173a(19) =128226a(20) =256692a(21) =513131a(22) =1026765a(23) =2053034a(24) =4107060a(25) =8213109a(26) =16428221a(27) =32854454a(28) =65712883a(29) =131421763
External references
- oeis: A217929