OFFSET
1,2
COMMENTS
EXAMPLE
Northwest corner:
1...3...5...8...11...14
2...4...6...9...12...15
7...10..13..16..20...24
17..21..25..29..33..38
34..39..44..49..54..59
MATHEMATICA
z = 70;
c[k_] := Sum[Floor[1/2 + Sqrt[2 j]], {j, 0, k}];
c = Table[c[k], {k, 1, z}] (* A060432 *)
f[n_] := If[MemberQ[c, n], 1, 1 + f[n - 1]]
f = Table[f[n], {n, 1, 600}] (* [A121997] *)
r[n_] := Flatten[Position[f, n]]
t[n_, k_] := r[n][[k]]
TableForm[Table[t[n, k], {n, 1, 7}, {k, 1, 7}]]
p = Flatten[Table[t[k, n - k + 1], {n, 1, 12}, {k, 1, n}]] (* A194077 *)
q[n_] := Position[p, n]; Flatten[Table[q[n], {n, 1, 90}]] (* A194078 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Aug 14 2011
STATUS
approved