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A143854 Ulam's spiral (WSW spoke). 1
1, 20, 71, 154, 269, 416, 595, 806, 1049, 1324, 1631, 1970, 2341, 2744, 3179, 3646, 4145, 4676, 5239, 5834, 6461, 7120, 7811, 8534, 9289, 10076, 10895, 11746, 12629, 13544, 14491, 15470, 16481, 17524, 18599, 19706, 20845, 22016, 23219, 24454 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

MATHEMATICA

f[n_] := 16n^2 -29n +14; Array[f, 40] (* Vladimir Orlovsky, Sep 03 2008 *)

CROSSREFS

Sequence in context: A053741 A052516 A083873 * A139241 A139232 A002292

Adjacent sequences:  A143851 A143852 A143853 * A143855 A143856 A143857

KEYWORD

nonn

AUTHOR

Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 03 2008

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Last modified February 16 05:50 EST 2012. Contains 205860 sequences.