A341300 a(n) = n!+(n-1)!+(n-2)!+(n-3)!+n-3.

10, 34, 154, 873, 5908, 46205, 408966, 4037047, 43948808, 522910089, 6749568010, 93924230411, 1401558681612, 22323869568013, 378005070643214, 6780291598080015, 128424084332544016, 2561305169719296017, 53651891654000640018, 1177646217057902592019

Offset

3,1

Links

Michael De Vlieger, Table of n, a(n) for n = 3..449

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[Total[(# - Range[0, 3])!] + # - 3 &, 20, 3] (* Michael De Vlieger, Apr 07 2021 *)

Crossrefs

Sequence in context: A067806 A001446 A264671 * A232902 A001890 A221810

Adjacent sequences: A341297 A341298 A341299 * A341301 A341302 A341303

Keyword

nonn

Author

N. J. A. Sloane, Feb 13 2021

Status

approved