login
A131785
a(n) = A131770( n*(n+1)/2 ) for n>=0.
1
1, 2, 8, 32, 156, 820, 4744, 29544, 196708, 1388012, 10320096, 80474620, 655800496, 5569011668, 49164525468, 450312766892, 4271622415228, 41898174547952, 424319014633656, 4431086950025056, 47656288619258248, 527272509796024344
OFFSET
0,2
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 15 2007
STATUS
approved