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A257956
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Row sums of A232642, when seen as a triangle read by rows.
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3
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1, 6, 24, 74, 220, 626, 1754, 4860, 13390, 36762, 100728, 275666, 753898, 2060924, 5632550, 15391650, 42056008, 114907626, 313947186, 857741852, 2343430222
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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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)
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PROG
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(Haskell)
a257956 = sum . a232642_row
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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