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A178441 INVERT transform of A058187, the tetrahedral numbers with repeats 0
1, 2, 7, 17, 46, 119, 311, 812, 2118, 5530, 14431, 37668, 98313, 256602, 669742, 1748052, 4562490, 11908280, 31081099, 81122927, 211734137, 552634698, 1442399007, 3764720003, 9826072122, 25646447377 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

Index entries for linear recurrences with constant coefficients, signature (2,3,-3,-3,3,1,-1).

FORMULA

G.f. 1/ ( 1-2*x-3*x^2+3*x^3+3*x^4-3*x^5-x^6+x^7 ). - R. J. Mathar, Apr 04 2012

EXAMPLE

a(4) = 46 = (10, 4, 4, 1, 1) dot (1, 1, 2, 7, 17) = (10 + 4 + 8 + 7 + 17)

CROSSREFS

Cf. A058187

Sequence in context: A239357 A106910 A108479 * A014742 A085411 A180665

Adjacent sequences:  A178438 A178439 A178440 * A178442 A178443 A178444

KEYWORD

nonn

AUTHOR

Gary W. Adamson, Dec 22 2010

EXTENSIONS

Corrected by R. J. Mathar, Apr 04 2012

STATUS

approved

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Last modified May 25 07:15 EDT 2020. Contains 334584 sequences. (Running on oeis4.)