1,2

Same as the number of strings of length n over Z_6 with trace 5 and subtrace 4.

F. Ruskey Number of strings over Z_6 of given trace and subtrace

a(n; t, s) = a(n-1; t, s) + a(n-1; t+5, s+5t+1) + a(n-1; t+4, s+4t+4) + a(n-1; t+3, s+3t+3) + a(n-1; t+2, s+2t+2) + a(n-1; t+1, s+t+1) where t is the trace and s is the subtrace.

a(2;5,4)=2 since the two 6-ary strings of trace 5, subtrace 4 and length 2 are { 14, 41 }.

Cf. A073971, A073972, A073973, A073974, A073975, A073976, A073977, A073978, A073979, A073980, A073982, A073983, A073984, A073985, A073986, A073987, A073988, A073989, A073990, A073991, A073992, A073993, A073994.

Sequence in context: A122006 A143561 A027302 this_sequence A006973 A137852 A097346

Adjacent sequences: A073978 A073979 A073980 this_sequence A073982 A073983 A073984

easy,nonn

Frank Ruskey, Nate Kube (fruskey(AT)cs.uvic.ca), Aug 16 2002