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A162619
Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A014689(n) = A000040(n)-n.
3
1, 1, 2, 2, 3, 4, 3, 4, 5, 6, 6, 7, 8, 9, 10, 7, 8, 9, 10, 11, 12, 10, 11, 12, 13, 14, 15, 16, 11, 12, 13, 14, 15, 16, 17, 18, 14, 15, 16, 17, 18, 19, 20, 21, 22, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 25, 26, 27, 28, 29, 30, 31, 32, 33
OFFSET
1,3
COMMENTS
Note that the last term of the n-th row is A000040(n)-1 = A006093(n).
See also A162618 and A162620.
EXAMPLE
Triangle begins:
.1;
.1, 2;
.2, 3, 4;
.3, 4, 5, 6;
.6, 7, 8, 9,10;
.7, 8, 9,10,11,12;
10,11,12,13,14,15,16;
11,12,13,14,15,16,17,18;
14,15,16,17,18,19,20,21,22;
19,20,21,22,23,24,25,26,27,28;
20,21,22,23,24,25,26,27,28,29,30;
KEYWORD
easy,nonn,tabl
AUTHOR
Omar E. Pol, Jul 10 2009
STATUS
approved