Number of n-digit cycles of length 3 under the Kaprekar map A151949.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =1a(8) =0a(9) =4a(10) =0a(11) =10a(12) =0a(13) =20a(14) =0a(15) =36a(16) =0a(17) =60a(18) =1a(19) =94a(20) =4a(21) =141a(22) =10a(23) =204a(24) =21a(25) =286a(26) =39a(27) =392a(28) =66a(29) =527