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A106523 Diagonal sums of number triangle A106522. 1
1, 1, 3, 4, 10, 14, 33, 49, 109, 170, 362, 586, 1207, 2011, 4037, 6878, 13536, 23464, 45475, 79891, 153011, 271612, 515460, 922372, 1738101, 3129565, 5865063, 10611336, 19802382, 35960970, 66888917, 121820229, 226016385, 412547222 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..33.

Index entries for linear recurrences with constant coefficients, signature (0,3,1,0,-1).

FORMULA

G.f.: (1+x)/((1+x-x^2)(1-x-x^2-x^3)); a(n)=3a(n-2)+a(n-3)-a(n-5).

CROSSREFS

Sequence in context: A173285 A025084 A134512 * A007068 A121720 A056515

Adjacent sequences:  A106520 A106521 A106522 * A106524 A106525 A106526

KEYWORD

easy,nonn

AUTHOR

Paul Barry, May 06 2005

STATUS

approved

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Last modified May 31 22:35 EDT 2020. Contains 334756 sequences. (Running on oeis4.)