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A004305 Simple triangulations of a disk: column 4 of square array in A210664.
(Formerly M3091)
2
3, 22, 85, 254, 644, 1448, 2967, 5645, 10109, 17214, 28093, 44212, 67430, 100064, 144959, 205563, 286007, 391190, 526869, 699754, 917608, 1189352, 1525175, 1936649, 2436849, 3040478, 3763997, 4625760, 5646154, 6847744, 8255423, 9896567, 11801195, 14002134, 16535189, 19439318, 22756812, 26533480, 30818839 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

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

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=0..38.

FORMULA

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

CROSSREFS

Cf. A210664.

Sequence in context: A075204 A106150 A135836 * A275290 A277228 A302272

Adjacent sequences:  A004302 A004303 A004304 * A004306 A004307 A004308

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Entry revised Mar 27 2012 by N. J. A. Sloane

STATUS

approved

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Last modified November 12 16:45 EST 2019. Contains 329058 sequences. (Running on oeis4.)