OFFSET
0,2
COMMENTS
a(n) = A155955(n,9) for n > 8. - Reinhard Zumkeller, Jan 31 2009
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..10000
Index entries for linear recurrences with constant coefficients, signature (10, -45, 120, -210, 252, -210, 120, -45, 10, -1).
FORMULA
a(n) = 387420489*A001017(n). - R. J. Mathar, Jul 07 2017
MATHEMATICA
(9*Range[0, 20])^9 (* or *) LinearRecurrence[{10, -45, 120, -210, 252, -210, 120, -45, 10, -1}, {0, 387420489, 198359290368, 7625597484987, 101559956668416, 756680642578125, 3904305912313344, 15633814156853823, 51998697814228992, 150094635296999121}, 20] (* Harvey P. Dale, Dec 11 2017 *)
PROG
(Magma) [(9*n)^9: n in [0..20]]; // Vincenzo Librandi, Jul 22 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved