login
A073974
Number of strings of length n over Z_6 with trace 0 and subtrace 3.
23
0, 1, 9, 54, 210, 1008, 6300, 40824, 262440, 1679616, 10478160, 62868960, 369476640, 2176782336, 12958657344, 77751944064, 468205557120, 2820249944064, 16957996040448, 101758315958784, 609954817881600, 3656158440062976, 21926486787222528, 131558920723335168
OFFSET
1,3
FORMULA
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.
CROSSREFS
Sequence in context: A152994 A034719 A013567 * A223927 A307045 A035927
KEYWORD
easy,nonn
AUTHOR
Frank Ruskey and Nate Kube, Aug 16 2002
EXTENSIONS
Terms a(11) onward from Max Alekseyev, Apr 09 2013
STATUS
approved