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A257956 Row sums of A232642, when seen as a triangle read by rows. 3
1, 6, 24, 74, 220, 626, 1754, 4860, 13390, 36762, 100728, 275666, 753898, 2060924, 5632550, 15391650, 42056008, 114907626, 313947186, 857741852, 2343430222 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) <= A166060(n).

LINKS

Table of n, a(n) for n=1..21.

FORMULA

Conjectures from Colin Barker, May 29 2015: (Start)

  a(n) = 3*a(n-1)+a(n-2)-4*a(n-3)-2*a(n-4) for n>4.

  G.f.: x*(5*x^2+3*x+1) / ((x^2+x-1)*(2*x^2+2*x-1)).

(End)

PROG

(Haskell)

a257956 = sum . a232642_row

CROSSREFS

Cf. A232642, A166060.

Sequence in context: A290132 A297713 A225383 * A080373 A180437 A276179

Adjacent sequences:  A257953 A257954 A257955 * A257957 A257958 A257959

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 14 2015

STATUS

approved

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Last modified October 22 19:53 EDT 2019. Contains 328319 sequences. (Running on oeis4.)