OFFSET
1,2
COMMENTS
LINKS
G. C. Greubel, Table of n, a(n) for the first 50 rows, flattened
FORMULA
T(n,k) = binomial(k+3,4)*binomial(n+3,4), k >= 1, n >= 1.
EXAMPLE
Northwest corner:
1, 5, 15, 35, 70
5, 25, 75, 175, 350
15, 75, 225, 525, 1050
35, 175, 425, 1225, 2450
MATHEMATICA
a[n_, k_] := Binomial[k + 3, 4]*Binomial[n + 3, 4]; Table[a[n - k + 1, k], {n, 10}, {k, n, 1, -1}] // Flatten (* G. C. Greubel, Jul 22 2017 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Feb 06 2011
STATUS
approved