0,2

a(n) = C(n) + 2^n - 1.

a(3) = 12 = C(3) + 2^3 - 1 = 5 + 8 = 1.

Cf. A000108, A000079.

Sequence in context: A025273 A089372 A036671 this_sequence A101411 A042789 A101911

Adjacent sequences: A132804 A132805 A132806 this_sequence A132808 A132809 A132810

nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 31 2007