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A109164
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a(n) = 4*a(n-1) - 4*a(n-2) + a(n-3), n >= 3.
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0
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1, 6, 20, 57, 154, 408, 1073, 2814, 7372, 19305, 50546, 132336, 346465, 907062, 2374724, 6217113, 16276618, 42612744, 111561617, 292072110, 764654716, 2001892041, 5241021410, 13721172192, 35922495169, 94046313318, 246216444788
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) - a(n-1) = A054486(n+1); G.f. (2*x+1)/((1-x)*(x^2-3*x+1))
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MATHEMATICA
| Join[{a=1, b=6}, Table[c=3*b-1*a+3; a=b; b=c, {n, 60}]] (*From Vladimir Joseph Stephan Orlovsky, Jan 28 2011*)
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PROG
| Floretion Algebra Multiplication Program, FAMP Code: 4tessumseq[ + .25'i + .25i' + .25'ii' + .25'jj' + .25'kk' + .25'jk' + .25'kj' + .25e], sumtype: (Y[15], *, vesy)
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CROSSREFS
| Cf. A054486.
Sequence in context: A048611 A200528 A127982 * A027984 A018808 A027107
Adjacent sequences: A109161 A109162 A109163 * A109165 A109166 A109167
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KEYWORD
| easy,nonn
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AUTHOR
| Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Aug 18 2005
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