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A161334
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Numbers of snowflake sequence, divided by 2: a(n) = A161330(n)/2.
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3
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0, 1, 4, 7, 10, 19, 22, 31, 40, 49, 64, 73, 88, 109, 112, 121, 130, 145, 172, 187, 226, 247, 274, 313, 334, 367, 406, 415, 436, 457, 484, 529, 562, 625, 670, 715, 766, 799, 838, 883, 928, 973, 1000, 1033, 1090, 1129, 1192, 1255, 1306, 1357, 1426, 1477
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OFFSET
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0,3
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COMMENTS
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Also number of E-toothpicks after n-th stage on the semi-infinite triangular grid. A161332 (the first differences) gives the number of E-toothpicks added at n-th stage. - Omar E. Pol, Jan 07 2014
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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