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A254464
a(n) = 21*2^n + 10*4^n + 15*3^n + 3*6^n + 6*5^n + 7^n + 28.
2
84, 210, 714, 2982, 14178, 73470, 404634, 2331462, 13906578, 85232910, 533860554, 3403329942, 22012307778, 144090486750, 952693102074, 6352175272422, 42655384385778, 288161867586990, 1956674663089194, 13344181547374902, 91343993647708578, 627261876368085630
OFFSET
0,1
COMMENTS
This is the sequence of seventh terms of "third partial sums of m-th powers".
LINKS
FORMULA
From Colin Barker, Jan 31 2015: (Start)
G.f.: -6*(40188*x^6 - 74058*x^5 + 52931*x^4 - 19005*x^3 + 3647*x^2 - 357*x + 14)/((x-1)*(2*x-1)*(3*x-1)*(4*x-1)*(5*x-1)*(6*x-1)*(7*x-1)).
a(n) = 28*a(n-1) - 322*a(n-2) + 1960*a(n-3) - 6769*a(n-4) + 13132*a(n-5) - 13068*a(n-6) + 5040*a(n-7). (End)
E.g.f.: exp(x)*(exp(x)*(exp(5*x) + 3*exp(4*x) + 6*exp(3*x) + 10*exp(2*x) + 15*exp(x) + 21) + 28). - Elmo R. Oliveira, Sep 16 2024
MATHEMATICA
Table[21 2^n + 10 4^n + 15 3^n + 3 6^n + 6 5^n + 7^n + 28, {n, 0, 24}] (* Michael De Vlieger, Jan 31 2015 *)
LinearRecurrence[{28, -322, 1960, -6769, 13132, -13068, 5040}, {84, 210, 714, 2982, 14178, 73470, 404634}, 30] (* Harvey P. Dale, May 17 2019 *)
PROG
(PARI) vector(30, n, n--; 21*2^n + 10*4^n + 15*3^n + 3*6^n + 6*5^n + 7^n + 28) \\ Colin Barker, Jan 31 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Luciano Ancora, Jan 31 2015
STATUS
approved