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 A103516 Triangle read by rows: count in a vee. 4
 1, 2, 2, 3, 0, 3, 4, 0, 0, 4, 5, 0, 0, 0, 5, 6, 0, 0, 0, 0, 6, 7, 0, 0, 0, 0, 0, 7, 8, 0, 0, 0, 0, 0, 0, 8, 9, 0, 0, 0, 0, 0, 0, 0, 9, 10, 0, 0, 0, 0, 0, 0, 0, 0, 10, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 14, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums are A103517, antidiagonal sums are A187012. LINKS FORMULA Number triangle T(n, k)=if(k<=n, 0^(k(n-k))*(n+1), 0) EXAMPLE Triangle begins 1, 2, 2, 3, 0, 3, 4, 0, 0, 4, 5, 0, 0, 0, 5, 6, 0, 0, 0, 0, 6, 7, 0, 0, 0, 0, 0, 7, 8, 0, 0, 0, 0, 0, 0, 8, ... MATHEMATICA Join[{1}, Flatten[Table[Flatten[Join[{n, PadRight[{}, n-2, 0], n}]], {n, 2, 15}]]] (* Harvey P. Dale, Mar 23 2013 *) PROG (PARI) tabl(nn) = {for (i=1, nn, for (j=1, i, if (j == 1, t = i, if (j==i, t = i, t = 0)); print1(t, ", "); ); print(); ); } \\ Michel Marcus, Aug 30 2013 CROSSREFS Sequence in context: A294898 A297114 A318448 * A233558 A319929 A129234 Adjacent sequences:  A103513 A103514 A103515 * A103517 A103518 A103519 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Feb 09 2005 STATUS approved

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Last modified September 20 22:06 EDT 2021. Contains 347591 sequences. (Running on oeis4.)