OFFSET
0,1
EXAMPLE
a(1) = 2 + 5 + 17 + 37 + 101 = 162.
a(2) = 2 + 5 + 17 + 37 + 101 + 197 + 257 + 401 + 577 + 677 + 1297 + 1601 + 2917 + 3137 + 4357 + 5477 + 7057 + 8101 + 8837 = 45052.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Seiichi Manyama, Mar 04 2018
STATUS
approved