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 A073963 Number of strings of length n over Z_5 with trace 0 and subtrace 0. 7
 1, 1, 1, 25, 125, 625, 3025, 15625, 78625, 393125, 1955625, 9765625, 48815625, 244140625, 1220703125, 6103515625, 30517265625, 152587890625, 762941015625, 3814705078125, 19073494140625, 95367431640625, 476837119140625, 2384185791015625, 11920928955078125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Same as the number of strings of length n over GF(5) with trace 0 and subtrace 0. LINKS Max Alekseyev, PARI/GP scripts for miscellaneous math problems FORMULA a(n; t, s) = a(n-1; t, s) + a(n-1; t+4, s+4t+1) + a(n-1; t+3, s+3t+4) + a(n-1; t+2, s+2t+4) + a(n-1; t+1, s+t+1). Empirical g.f.: -x*(525*x^6-525*x^5+190*x^4-26*x^2+9*x-1) / ((5*x-1)*(5*x^2-1)*(25*x^4-25*x^3+15*x^2-5*x+1)). - Colin Barker, Apr 03 2015 CROSSREFS Cf. A073964, A073965, A073966, A073967, A073968, A073969, A073970. Sequence in context: A211595 A066609 A074006 * A316277 A201842 A057902 Adjacent sequences: A073960 A073961 A073962 * A073964 A073965 A073966 KEYWORD easy,nonn AUTHOR Frank Ruskey and Nate Kube, Aug 15 2002 EXTENSIONS Terms a(11) onward from Max Alekseyev, Apr 09 2013 STATUS approved

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Last modified February 3 23:01 EST 2023. Contains 360045 sequences. (Running on oeis4.)