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 A082375 Triangular array read by rows: n-th row begins with n and decreases by 2 until 0 or 1 is reached. 1
 0, 1, 2, 0, 3, 1, 4, 2, 0, 5, 3, 1, 6, 4, 2, 0, 7, 5, 3, 1, 8, 6, 4, 2, 0, 9, 7, 5, 3, 1, 10, 8, 6, 4, 2, 0, 11, 9, 7, 5, 3, 1, 12, 10, 8, 6, 4, 2, 0, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 0, 15, 13, 11, 9, 7, 5, 3, 1, 16, 14, 12, 10, 8, 6, 4, 2, 0, 17, 15, 13, 11, 9, 7, 5, 3, 1, 18, 16, 14 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS a(n)=A025644(n+1) for n<=142. LINKS EXAMPLE 0; 1; 2,0; 3,1; 4,2,0; 5,3,1; 6,4,2,0; 7,5,3,1; ... PROG (PARI) a(n)=local(m); if(n<0, 0, m=sqrtint(1+4*n); m-1-(1+4*n-m^2)\2) CROSSREFS Sequence in context: A194549 A063277 A029178 * A025644 A022332 A215589 Adjacent sequences:  A082372 A082373 A082374 * A082376 A082377 A082378 KEYWORD nonn,tabf AUTHOR Michael Somos, Apr 09 2003 STATUS approved

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