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A131786 Repeated terms in A131771; a(n) = A131770( (n+1)*(n+2)/2 - 1 ) for n>=0. 1
1, 4, 20, 104, 592, 3592, 23212, 158652, 1141964, 8621820, 68063300, 560324488, 4799515756, 42690098440, 393605305676, 3755794383536, 37034899306132, 376877989985712, 3953002335087184, 42686126230197500, 474037727935110620 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 7 19:57 EDT 2020. Contains 336279 sequences. (Running on oeis4.)