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A139616
a(n) = 120*n + 16.
3
16, 136, 256, 376, 496, 616, 736, 856, 976, 1096, 1216, 1336, 1456, 1576, 1696, 1816, 1936, 2056, 2176, 2296, 2416, 2536, 2656, 2776, 2896, 3016, 3136, 3256, 3376, 3496, 3616, 3736, 3856, 3976, 4096, 4216, 4336, 4456, 4576, 4696, 4816
OFFSET
0,1
COMMENTS
Numbers of the 16th column of positive numbers in the square array of nonnegative and polygonal numbers A139600. Also, numbers of the 16th column in the square array A057145.
FORMULA
a(n) = 2*a(n-1)-a(n-2). - Wesley Ivan Hurt, Jun 17 2021
From Elmo R. Oliveira, Apr 04 2024: (Start)
G.f.: 8*(2+13*x)/(x-1)^2.
E.g.f.: 8*exp(x)*(2 + 15*x).
a(n) = 8*(A008597(n) + 2). (End)
PROG
(Magma) [8*(15*n + 2): n in [0..60]]; // Vincenzo Librandi, Jul 23 2011
(PARI) a(n)=120*n+16 \\ Charles R Greathouse IV, Oct 05 2011
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Apr 27 2008
STATUS
approved