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A220520
Number of toothpicks and D-toothpicks after n-th stage in the D-toothpick "wide" triangle of the third kind.
14
0, 1, 3, 7, 11, 15, 19, 27, 35, 39, 43, 51, 63, 79, 91, 107, 123, 127, 131, 139, 151, 167, 187, 211, 237, 261, 273, 293, 325, 365, 393, 425, 457, 461, 465, 473, 485, 501, 521, 545, 571, 595, 615, 647, 691, 755, 807, 855, 909, 944, 961, 981, 1017, 1065
OFFSET
0,3
COMMENTS
The structure is essentially one of the vertical wedges of several D-toothpick structures. For more information see A220500. First differs from A194440 at a(14). The first differences (A220521) give the number of toothpicks or D-toothpicks added at n-th stage. See A220522 for the "narrow" triangle of the third kind.
KEYWORD
nonn
AUTHOR
Omar E. Pol, Dec 15 2012
STATUS
approved