0,3

Partial sums are A092896. a(n+2)/4=A002001(n).

a(n)=3*4^n/16+13*0^n/16+sum{k=0..n, binom(n, k)(-1)^k(3k/4+k(k-1)/2) }

Sequence in context: A019309 A056632 A149385 this_sequence A110594 A151483 A111930

Adjacent sequences: A092895 A092896 A092897 this_sequence A092899 A092900 A092901

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Mar 12 2004