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A261230
a(n) = A261236(n) - A261237(n).
5
-1, 0, 1, 2, 3, 6, 12, 28, 71, 186, 494, 1317, 3478, 9045, 23265, 59856, 155779, 412413, 1108874, 3009228, 8188150, 22257484, 60462422, 164715758, 452011067, 1253176571
OFFSET
0,4
FORMULA
a(n) = A261236(n) - A261237(n).
MATHEMATICA
Table[Length@ # - 2 First@ FirstPosition[#, k_ /; k != 2] + 1 &@ Map[First@ IntegerDigits[#, 3] &, #] &@ NestWhileList[# - Total@ IntegerDigits[#, 3] &, 3^(n + 1) - 1, # > 3^n - 1 &], {n, 0, 16}] (* Michael De Vlieger, Jun 27 2016, Version 10 *)
PROG
(Scheme) (define (A261230 n) (- (A261236 n) (A261237 n)))
CROSSREFS
KEYWORD
sign
AUTHOR
Antti Karttunen, Aug 16 2015
EXTENSIONS
Terms a(24) & a(25) from Antti Karttunen, Jun 27 2016
STATUS
approved