OFFSET
1,3
EXAMPLE
Antidiagonal starting at T(7,1) is 720, 48, 6, 1, so a(7) = 775.
PROG
(Magma) m:=21; T:=[ [ k*Factorial(j-k): k in [1..j-1] ] cat [ 1 ]: j in [1..m] ]; [ &+[ T[j-k+1][k]: k in [1..(j+1) div 2] ]: j in [1..m] ];
CROSSREFS
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, May 28 2007
STATUS
approved