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A048504
a(n) = T(n,n), array T given by A048494.
1
1, 2, 7, 28, 101, 326, 967, 2696, 7177, 18442, 46091, 112652, 270349, 638990, 1490959, 3440656, 7864337, 17825810, 40108051, 89653268, 199229461, 440401942, 968884247, 2122317848, 4630511641
OFFSET
0,2
FORMULA
a(n) = n*(n-1)*2^(n-1) + n + 1. - Ralf Stephan, Jan 15 2004
G.f.: (-1 - 4*x^4 + 16*x^3 - 16*x^2 + 6*x)/((x-1)^2*(2*x-1)^3). - Maksym Voznyy (voznyy(AT)mail.ru), Aug 13 2009
MATHEMATICA
Table[n(n-1)2^(n-1)+n+1, {n, 0, 30}] (* or *) LinearRecurrence[{8, -25, 38, -28, 8}, {1, 2, 7, 28, 101}, 30] (* Harvey P. Dale, Jul 29 2021 *)
PROG
(Magma) [n*(n-1)*2^(n-1) + n + 1 : n in [0..30]]; // Vincenzo Librandi, Sep 25 2011
CROSSREFS
Sequence in context: A102961 A155581 A349329 * A092465 A099488 A289607
KEYWORD
nonn,easy
STATUS
approved