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A030280 COMPOSE triangular numbers with triangular numbers. 0
1, 6, 30, 137, 588, 2415, 9600, 37209, 141336, 528049, 1945800, 7086555, 25550547, 91319973, 323890062, 1140985116, 3995155506, 13913280006, 48216776266, 166355744244, 571636515369, 1957015021744, 6677155551312 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

N. J. A. Sloane, Transforms

FORMULA

G.f.: [(1-x)^6]/[(1-4x+3x^2-x^3)^3].

CROSSREFS

Sequence in context: A036068 A162743 A081895 * A034545 A002920 A192208

Adjacent sequences:  A030277 A030278 A030279 * A030281 A030282 A030283

KEYWORD

nonn,nice

AUTHOR

Christian G. Bower (bowerc(AT)usa.net)

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Last modified February 14 04:22 EST 2012. Contains 205570 sequences.