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 A164002 Triangle read by rows in which each row contains a finite triangle as shown below. 4
 1, 1, 1, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 2, 3, 2, 1, 2, 2, 1, 1, 2, 2, 2, 3, 2, 2, 3, 3, 2, 1, 2, 2, 2, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 3, 2, 3, 4, 3, 2, 1, 2, 3, 3, 2, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 3, 3, 4, 5, 4, 3, 2, 3, 4, 4, 3, 2, 1, 2, 3, 3, 3, 2, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 3, 3, 4, 5, 4, 3, 3, 4, 5, 5, 4, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 COMMENTS See also A159800. LINKS EXAMPLE The main triangle begins: 1 1,1,1 1,2,2,1,2,1 1,2,2,2,3,2,1,2,2,1 1,2,2,2,3,2,2,3,3,2,1,2,2,2,1 1,2,2,3,3,3,3,4,4,3,2,3,4,3,2,1,2,3,3,2,1 1,2,2,3,3,3,3,4,4,3,3,4,5,4,3,2,3,4,4,3,2,1,2,3,3,3,2,1 1,2,2,3,3,3,3,4,4,3,3,4,5,4,3,3,4,5,5,4,3,2,3,4,4,4,3,2,1,2,3,3,3,3,2,1 In which row 1 contains a vertex, only: 1 Row 2 contains the triangle: 1 1,1 Row 3 contains the triangle: 1 2,2 1,2,1 Row 4 contains the triangle: 1 2,2 2,3,2 1,2,2,1 Row 5 contains the triangle: 1 2,2 2,3,2 2,3,3,2 1,2,2,2,1 Row 6 contains the triangle: 1 2,2 3,3,3 3,4,4,3 2,3,4,3,2 1,2,3,3,2,1 Row 7 contains the triangle: 1 2,2 3,3,3 3,4,4,3 3,4,5,4,3 2,3,4,4,3,2 1,2,3,3,3,2,1 Row 8 contains the triangle: 1 2,2 3,3,3 3,4,4,3 3,4,5,4,3 3,4,5,5,4,3 2,3,4,4,4,3,2 1,2,3,3,3,3,2,1 Row 9 contains the triangle: 1 2,2 3,3,3 4,4,4,4 4,5,5,5,4 4,5,6,6,5,4 3,4,5,6,5,4,3 2,3,4,5,5,4,3,2 1,2,3,4,4,4,3,2,1 Row 10 contains the triangle: 1 2,2 3,3,3 4,4,4,4 4,5,5,5,4 4,5,6,6,5,4 4,5,6,7,6,5,4 3,4,5,6,6,5,4,3 2,3,4,5,5,5,4,3,2 1,2,3,4,4,4,4,3,2,1 And so on... CROSSREFS Cf. A159800, A163993, A163994. Sequence in context: A001285 A088424 A097456 * A182596 A087775 A089955 Adjacent sequences:  A163999 A164000 A164001 * A164003 A164004 A164005 KEYWORD nonn,tabf AUTHOR Omar E. Pol, Nov 10 2009 STATUS approved

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