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 A018037 Powers of cube root of 21 rounded to nearest integer. 22
 1, 3, 8, 21, 58, 160, 441, 1217, 3357, 9261, 25550, 70492, 194481, 536558, 1480324, 4084101, 11267725, 31086799, 85766121, 236622225, 652822777, 1801088541, 4969066720, 13709278307, 37822859361, 104350401111, 287894844440, 794280046581, 2191358423329 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 MATHEMATICA Table[Round[21^(n/3)], {n, 0, 40}] (* Vincenzo Librandi, Jan 08 2014 *) PROG (MAGMA) [Round(21^(n/3)): n in [0..40]]; // Vincenzo Librandi, Jan 08 2014 CROSSREFS Cf. powers of cube root of k rounded up: A017980 (k=2), A017983 (k=3), A017986 (k=4), A017989 (k=5), A017992 (k=6), A017995 (k=7), A018001 (k=9), A018004 (k=10), A018007 (k=11), A018010 (k=12), A018013 (k=13), A018016 (k=14), A018019 (k=15), A018022 (k=16), A018025 (k=17), A018028 (k=18), A018031 (k=19), A018034 (k=20), this sequence (k=21), A018040 (k=22), A018043 (k=23), A018046 (k=24). Sequence in context: A014318 A158495 A273720 * A018038 A000737 A192235 Adjacent sequences:  A018034 A018035 A018036 * A018038 A018039 A018040 KEYWORD nonn AUTHOR EXTENSIONS More terms from Vincenzo Librandi, Jan 08 2014 STATUS approved

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Last modified January 17 15:12 EST 2020. Contains 330958 sequences. (Running on oeis4.)