Number of sequences of n 2's and 3's with curling number 2 and which have the form XY^2 where Y has length 1 (so Y is 2 or 3).

A217931

Number of sequences of n 2's and 3's with curling number 2 and which have the form XY^2 where Y has length 1 (so Y is 2 or 3).

Terms

    a(0) =0a(1) =2a(2) =2a(3) =4a(4) =8a(5) =16a(6) =32a(7) =64a(8) =126a(9) =252a(10) =504a(11) =1004a(12) =2008a(13) =4016a(14) =8024a(15) =16048a(16) =32096a(17) =64178a(18) =128356a(19) =256712a(20) =513392a(21) =1026784a(22) =2053568a(23) =4107076a(24) =8214152a(25) =16428304a(26) =32856482a(27) =65712964a(28) =131425928a(29) =262851612

External references