A088231 Triangle read by rows: T(n,k) = number of squares not less than n-k and not greater n+k, 0<=k<n.

1, 0, 1, 0, 1, 2, 1, 1, 1, 2, 0, 1, 1, 1, 3, 0, 0, 1, 2, 2, 3, 0, 0, 1, 2, 2, 2, 3, 0, 1, 1, 1, 2, 2, 2, 3, 1, 1, 1, 1, 1, 2, 2, 3, 4, 0, 1, 1, 1, 1, 1, 3, 3, 3, 4, 0, 0, 1, 1, 1, 2, 2, 3, 3, 3, 4, 0, 0, 0, 1, 2, 2, 2, 2, 3, 3, 3, 4, 0, 0, 0, 1, 2, 2, 2, 2, 2, 3, 3, 3, 5, 0, 0, 1, 1, 1, 2, 2, 2, 2, 2, 3

Offset

1,6

Comments

T(n,0) = A010052(n); T(n,n-1) = A000196(2*n-1).

Links

Table of n, a(n) for n=1..102.

Mathematica

T[n_, k_] := Select[Range[n-k, n+k], IntegerQ@Sqrt@#&] // Length;
Table[T[n, k], {n, 1, 14}, {k, 0, n-1}] // Flatten (* Jean-François Alcover, Sep 15 2021 *)

Crossrefs

Sequence in context: A320835 A276183 A056563 * A327954 A336386 A378622

Adjacent sequences: A088228 A088229 A088230 * A088232 A088233 A088234

Keyword

nonn,tabl

Author

Reinhard Zumkeller, Nov 03 2003

Status

approved