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A120139
a(n) = 11 + floor( (1 + Sum_{j=1..n-1} a(j)) / 2).
3
11, 17, 25, 38, 57, 85, 128, 192, 288, 432, 648, 972, 1458, 2187, 3280, 4920, 7380, 11070, 16605, 24908, 37362, 56043, 84064, 126096, 189144, 283716, 425574, 638361, 957542, 1436313, 2154469, 3231704, 4847556, 7271334, 10907001, 16360501
OFFSET
1,1
LINKS
MATHEMATICA
a[n_]:= a[n]= 11 +Quotient[1 + Sum[a[k], {k, n-1}], 2];
Table[a[n], {n, 60}] (* G. C. Greubel, May 08 2023 *)
PROG
(SageMath)
@CachedFunction
def A120139(n): return 11 +(1 +sum(A120139(k) for k in range(1, n)))//2
[A120139(n) for n in range(1, 60)] # G. C. Greubel, May 08 2023
KEYWORD
nonn
AUTHOR
Graeme McRae, Jun 10 2006
STATUS
approved