1,4
Table of n, a(n) for n=1..6.
Eric Weisstein's World of Mathematics, Hi-Q
Sequence in context: A292196 A076230 A118076 * A111194 A096132 A078083
Adjacent sequences: A056743 A056744 A056745 * A056747 A056748 A056749
hard,nonn
David W. Wilson, Aug 15 2000
approved