A131786 Repeated terms in A131771; a(n) = A131770( (n+1)*(n+2)/2 - 1 ) for n>=0.

1, 4, 20, 104, 592, 3592, 23212, 158652, 1141964, 8621820, 68063300, 560324488, 4799515756, 42690098440, 393605305676, 3755794383536, 37034899306132, 376877989985712, 3953002335087184, 42686126230197500, 474037727935110620

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Crossrefs

Cf. A131770, A131771, A131785.

Sequence in context: A192619 A026305 A195256 * A061709 A254537 A135159

Adjacent sequences: A131783 A131784 A131785 * A131787 A131788 A131789

Keyword

nonn

Author

Paul D. Hanna, Jul 15 2007

Status

approved