OFFSET
1,2
LINKS
Robert Israel, Table of n, a(n) for n = 1..10011 (first 141 antidiagonals, flattened)
FORMULA
G.f. as rectangular array: [xy(1+4x+x^2)(1+4y+y^2)] / [(1-x)^4 * (1-y)^4 ]. - Ralf Stephan, Oct 27 2004, corrected by Robert Israel, Jun 27 2018
a(n) = A003991(n)^3.- Robert Israel, Jun 27 2018
EXAMPLE
1; 8,8; 27,64,27; 64,216,216,64; ...
MAPLE
seq(seq(i^3*(m-i)^3, i=1..m-1), m=2..10); # Robert Israel, Jun 27 2018
MATHEMATICA
With[{s = Range[10]^3}, Table[s[[#]] s[[j]] &[i - j + 1], {i, Length@s}, {j, i}]] // Flatten (* Michael De Vlieger, Jun 27 2018 *)
PROG
(GAP) Flat(List([2..11], m->List([1..m-1], i->i^3*(m-i)^3))); # Muniru A Asiru, Jun 27 2018
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Douglas Stones (dssto1(AT)student.monash.edu.au), Sep 04 2004
EXTENSIONS
More terms from Ralf Stephan, Oct 27 2004
Offset corrected by Robert Israel, Jun 27 2018
STATUS
approved