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A341301 a(n) = ceiling(n^2 - 7*n/3 + 19/3). 1
5, 6, 9, 13, 20, 29, 39, 52, 67, 83, 102, 123, 145, 170, 197, 225, 256, 289, 323, 360, 399, 439, 482, 527, 573, 622, 673, 725, 780, 837, 895, 956, 1019, 1083, 1150, 1219, 1289, 1362, 1437, 1513, 1592, 1673, 1755, 1840, 1927, 2015, 2106, 2199, 2293, 2390, 2489, 2589, 2692 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Michael Engen and Vincent Vatter, Containing all permutations, Amer. Math. Monthly, 128 (2021), 4-24; arXiv preprint, arXiv:1810.08252 [math.CO], 2018-2020.

MATHEMATICA

Array[Ceiling[#^2 - 7 #/3 + 19/3] &, 53] (* Michael De Vlieger, Apr 07 2021 *)

CROSSREFS

Sequence in context: A242733 A195928 A047438 * A218735 A301658 A286338

Adjacent sequences:  A341298 A341299 A341300 * A341302 A341303 A341304

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 13 2021

STATUS

approved

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Last modified September 18 02:31 EDT 2021. Contains 347504 sequences. (Running on oeis4.)