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A196512
Expansion of (1-9x)/(1-28x).
1
1, 19, 532, 14896, 417088, 11678464, 326996992, 9155915776, 256365641728, 7178237968384, 200990663114752, 5627738567213056, 157576679881965568, 4412147036695035904, 123540117027461005312
OFFSET
0,2
FORMULA
a(n) = 19*28^(n-1) for n > 0, a(0)=1.
a(n) = Sum_{k=0..n} A193722(n,k)*9^k.
MATHEMATICA
Join[{1}, 19*28^Range[0, 20]] (* Harvey P. Dale, Dec 06 2015 *)
PROG
(PARI) a(n)=if(n, 19*28^(n-1), 1) \\ M. F. Hasler, Oct 06 2011
(Magma) [1], [19*28^(n-1) : n in [1..15]]; // Vincenzo Librandi, Oct 06 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Philippe Deléham, Oct 05 2011
STATUS
approved