OFFSET
1,2
COMMENTS
LINKS
G. C. Greubel, Table of n, a(n) for the first 100 rows, flattened
EXAMPLE
Northwest corner:
1, 3, 6, 10, 15, 21
2, 5, 9, 14, 20, 27, 35
4, 7, 11, 16, 22, 29, 37
8, 13, 19, 26, 34, 43, 53
12, 18, 25, 33, 42, 52, 63
MATHEMATICA
r = Sqrt[2]; p[n_] := n - Floor[n/r]
Table[p[n], {n, 1, 90}] (* A194920 *)
g[1] = {1}; g[n_] := Insert[g[n - 1], n, p[n]]
f[1] = g[1]; f[n_] := Join[f[n - 1], g[n]]
f[20] (* A194921 *)
row[n_] := Position[f[30], n];
u = TableForm[Table[row[n], {n, 1, 5}]]
v[n_, k_] := Part[row[n], k];
w = Flatten[Table[v[k, n - k + 1], {n, 1, 13},
{k, 1, n}]] (* A194922 *)
q[n_] := Position[w, n]; Flatten[Table[q[n],
{n, 1, 80}]] (* A195071 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Sep 08 2011
STATUS
approved