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A006947 Two-rowed truncated monotone triangles.
(Formerly M1797)
0
2, 7, 35, 219, 1594, 12935, 113945, 1070324, 10586856, 109259633, 1168384157, 12877168147, 145656436074, 1685157199175, 19886174611045, 238819338399054, 2913166800256664, 36036122671902718, 451429953643336590, 5720172601392931006 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..20.

W. H. Mills et al., Self-complementary totally symmetric plane partitions, J. Combin. Theory, A 42 (1986), 277-292.

D. Zeilberger, Proof of the Alternating Sign Matrix Conjecture, Electronic J. Comb., 3(2) R13, 1996.

CROSSREFS

Sequence in context: A260530 A201690 A080831 * A182224 A317421 A292182

Adjacent sequences:  A006944 A006945 A006946 * A006948 A006949 A006950

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(17)-a(21) from Sean A. Irvine, Sep 05 2017

STATUS

approved

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Last modified February 20 13:33 EST 2019. Contains 320327 sequences. (Running on oeis4.)