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A220522
Number of toothpicks and D-toothpicks after n-th stage in the D-toothpick "narrow" triangle of the third kind.
13
0, 1, 3, 7, 11, 15, 19, 26, 34, 38, 42, 50, 62, 70, 78, 91, 107, 111, 115, 123, 135, 151, 167, 187, 211, 223, 231, 247, 275, 291, 307, 332, 364, 368, 372, 380, 392, 408, 424, 446, 478, 504, 524, 548, 588, 620, 660, 701, 749, 769, 777
OFFSET
0,3
COMMENTS
The structure is essentially one of the oblique wedges of several D-toothpick structures. For more information see A220500. First differs from A194442 at a(47). The first differences (A220523) give the number of toothpicks or D-toothpicks added at n-th stage.
KEYWORD
nonn
AUTHOR
Omar E. Pol, Dec 15 2012
STATUS
approved