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A366478
a(n) = (3*n^4 - 4*n^3 + n^2 + 4*n + 4)/4.
7
1, 2, 8, 40, 137, 356, 772, 1478, 2585, 4222, 6536, 9692, 13873, 19280, 26132, 34666, 45137, 57818, 73000, 90992, 112121, 136732, 165188, 197870, 235177, 277526, 325352, 379108, 439265, 506312, 580756, 663122, 753953, 853810, 963272, 1082936, 1213417, 1355348, 1509380
OFFSET
0,2
COMMENTS
This is one-third of the total number of points in the configuration obtained at the n-th stage of A365929.
FORMULA
G.f.: -(2*x^4+10*x^3+8*x^2-3*x+1)/(x-1)^5. - Alois P. Heinz, Nov 02 2023
MATHEMATICA
Table[(3n^4 - 4n^3 + n^2 + 4n + 4) /4, {n, 0, 38}] (* Paul F. Marrero Romero, Nov 02 2023 *)
CROSSREFS
Cf. A365929.
Sequence in context: A152458 A087971 A127919 * A074092 A003445 A181326
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Oct 29 2023
STATUS
approved