login
A047883
Squares on unbounded chessboard for which the least number of knight's moves from corner (0,0) is n.
2
0, 2, 9, 20, 27, 32, 39, 46, 53, 60, 67, 74, 81, 88, 95, 102, 109, 116, 123, 130, 137, 144, 151, 158, 165, 172, 179, 186, 193, 200, 207, 214, 221, 228, 235
OFFSET
0,2
FORMULA
a(n)=7+a(n-1) for n >= 6.
MATHEMATICA
Join[{0, 2, 9, 20, 27}, NestList[#+7&, 32, 30]] (* Harvey P. Dale, Sep 07 2013 *)
CROSSREFS
Cf. A098500 (partial sums).
Sequence in context: A116014 A090939 A077338 * A042915 A007115 A154495
KEYWORD
nonn
STATUS
approved