OFFSET
0,9
FORMULA
a(n) = permanent(m), where the n X n matrix m is defined by m(i,j) = 1 or 0, depending on whether i+j is a triangular number or not.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ray Chandler, Jul 26 2004
EXTENSIONS
More terms from David Wasserman, Nov 27 2007
a(0) and a(31)-a(38) from Martin Ehrenstein, Mar 03 2024
STATUS
approved