OFFSET
1,1
COMMENTS
LINKS
G. C. Greubel, Table of n, a(n) for the first 50 rows, flattened
FORMULA
T(n,k) = 2*n + (n+k-1)*(2*n+2*k-3), k>=1, n>=1.
EXAMPLE
Northwest corner:
3....8....17...30...47
10...19...32...49...70
21...34...51...72...97
36...53...74...99...128
MATHEMATICA
f[n_, k_]:=2n+(2n+2k-3)(n+k-1);
TableForm[Table[f[n, k], {n, 1, 10}, {k, 1, 15}]]
Table[f[n-k+1, k], {n, 14}, {k, n, 1, -1}]//Flatten
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Feb 05 2011
STATUS
approved