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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 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 EXTENSIONS Entry revised Mar 27 2012 by N. J. A. Sloane STATUS approved

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Last modified February 27 08:51 EST 2020. Contains 332301 sequences. (Running on oeis4.)