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A004305 Simple triangulations of a disk: column 4 of square array in A210664.
(Formerly M3091)
2

%I M3091

%S 3,22,85,254,644,1448,2967,5645,10109,17214,28093,44212,67430,100064,

%T 144959,205563,286007,391190,526869,699754,917608,1189352,1525175,

%U 1936649,2436849,3040478,3763997,4625760,5646154,6847744,8255423,9896567,11801195,14002134,16535189,19439318,22756812,26533480,30818839

%N Simple triangulations of a disk: column 4 of square array in A210664.

%D P. N. Rathie, A census of simple planar triangulations, J. Combin. Theory, B 16 (1974), 134-138.

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

%F a(n) = (n^6+15*n^5+103*n^4+405*n^3+976*n^2+1236*n+432)/144.

%Y Cf. A210664.

%K nonn

%O 0,1

%A _N. J. A. Sloane_.

%E Entry revised Mar 27 2012 by _N. J. A. Sloane_

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Last modified March 28 15:06 EDT 2020. Contains 333089 sequences. (Running on oeis4.)