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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..2000

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

PROG

(MAGMA) [n*(n-1)*2^(n-1) + n + 1 : n in [0..30]]; // Vincenzo Librandi, Sep 25 2011

CROSSREFS

Sequence in context: A123363 A102961 A155581 * A092465 A099488 A289607

Adjacent sequences:  A048501 A048502 A048503 * A048505 A048506 A048507

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)