0,3

Tan[ x ]*(1+x)

a(2n) = A009752(n), a(2n+1) = A000182(n+1).

Sequence in context: A109190 A016120 A085542 this_sequence A053098 A067640 A098277

Adjacent sequences: A009722 A009723 A009724 this_sequence A009726 A009727 A009728

nonn,easy

R. H. Hardin (rhhardin(AT)att.net)