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A147832
Numbers congruent (0,2) mod 14.
0
0, 2, 14, 16, 28, 30, 42, 44, 56, 58, 70, 72, 84, 86, 98, 100, 112, 114, 126, 128, 140, 142, 154, 156, 168, 170, 182, 184, 196, 198, 210, 212, 224, 226, 238, 240, 252, 254, 266, 268, 280, 282, 294, 296, 308, 310, 322, 324, 336, 338, 350, 352, 364, 366, 378, 380
OFFSET
1,2
FORMULA
Except for the initial term, a(n) = A113801(n-1) + 1.
a(n) = 14*n - a(n-1) - 26 (with a(1)=0). - Vincenzo Librandi, Dec 17 2010
From Bruno Berselli, Dec 17 2010: (Start)
G.f.: 2*x^2*(1+6*x)/((1+x)*(1-x)^2).
a(n) = 2*A047274(n) = (14*n - 5*(-1)^n - 19)/2.
a(n) = 2*(A001106(n-1) - Sum_{i=1..n-1} a(i)) for n > 1. (End)
MATHEMATICA
Flatten[{#, #+2}&/@(14 Range[0, 30])] (* Harvey P. Dale, Dec 25 2010 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Nov 14 2008
EXTENSIONS
382 replaced with 380 by R. J. Mathar, Jun 28 2010
STATUS
approved