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A067404
Fourth column of triangle A067402.
4
1, 7, 112, 1792, 28672, 458752, 7340032, 117440512, 1879048192, 30064771072, 481036337152, 7696581394432, 123145302310912, 1970324836974592, 31525197391593472, 504403158265495552, 8070450532247928832, 129127208515966861312, 2066035336255469780992, 33056565380087516495872
OFFSET
0,2
FORMULA
a(n) = A067402(n+3, 3).
a(n) = 7*16^(n-1), n>=1, a(0) = 1.
G.f.: (1-9*x)/(1-16*x).
E.g.f.: (9 + 7*exp(16*x))/16. - Stefano Spezia, Sep 30 2022
MATHEMATICA
CoefficientList[Series[(1-9x)/(1-16x), {x, 0, 20}], x] (* Harvey P. Dale, Jun 02 2017 *)
CROSSREFS
Cf. A067403 (third column), A067405 (fifth column), A001025 (powers of 16).
Cf. A067402.
Sequence in context: A094219 A212702 A217223 * A129030 A128576 A147631
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Jan 25 2002
EXTENSIONS
More terms from Harvey P. Dale, Jun 02 2017
STATUS
approved