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A214318
Replace the word A214317(n) with its position in A007931.
4
1, 4, 9, 19, 40, 81, 164, 329, 659, 1320, 2641, 5283, 10568, 21137, 42276, 84553, 169107, 338216, 676433, 1352868, 2705737, 5411475, 10822952, 21645905, 43291811, 86583624, 173167249, 346334500, 692669001, 1385338003, 2770676008, 5541352017, 11082704035
OFFSET
1,2
LINKS
FORMULA
a(n) = A182028(n-1)+2^n-1.
a(n) = 2*a(n-1) + A003842(n-1) for n>1, a(1) = 1. - Alois P. Heinz, Jul 19 2012
EXAMPLE
A214317(5) = 12112 is the 40th term of A007931, so a(5)=40.
MAPLE
S:= proc(n) option remember;
`if`(n<2, [2-n], [S(n-1)[], S(n-2)[]])
end:
a:= proc(n) option remember; local k;
for k while nops(S(k))<n do od;
`if`(n=1, 1, 2*a(n-1) +S(k)[n])
end:
seq(a(n), n=1..50); # Alois P. Heinz, Jul 19 2012
MATHEMATICA
nesting = 6; A003849 = Flatten[Nest[{#, #[[1]]}&, {0, 1}, nesting]]; A182028[n_] := FromDigits[Take[A003849, n+1], 2]; a[n_] := A182028[n-1] + 2^n - 1; Table[a[n], {n, 1, Length[A003849]}] (* Jean-François Alcover, Feb 13 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 12 2012
EXTENSIONS
More terms from Alois P. Heinz, Jul 19 2012
STATUS
approved