login
A057054
Let R(i,j) be the rectangle with antidiagonals 1; 2,3; 4,5,6; ...; n^3 is in antidiagonal a(n).
3
1, 4, 7, 11, 16, 21, 26, 32, 38, 45, 52, 59, 66, 74, 82, 91, 99, 108, 117, 126, 136, 146, 156, 166, 177, 187, 198, 210, 221, 232, 244, 256, 268, 280, 293, 305, 318, 331, 344, 358, 371, 385, 399, 413, 427, 441, 456, 470, 485, 500
OFFSET
1,2
FORMULA
Round(n*(sqrt(2*n))). - Vladeta Jovovic, Jun 14 2003
MATHEMATICA
Table[Round[n Sqrt[2n]], {n, 50}] (* Harvey P. Dale, Feb 10 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jul 30 2000
STATUS
approved