1,3

Counting and configurations, Jiri Herman et al., see page 3

a(n)= 8 (n - 4)^2 + (n - 2) 16 + 46 + (n - 2) 24 for n > 4

Sequence in context: A006564 A059162 A117027 this_sequence A007200 A061148 A052601

Adjacent sequences: A161168 A161169 A161170 this_sequence A161172 A161173 A161174

nonn

Srikanth K S (sriperso(AT)gmail.com), Jun 04 2009