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A033551 Closest integer to (Pi/4)*n^2. 0
1, 3, 7, 13, 20, 28, 38, 50, 64, 79, 95, 113, 133, 154, 177, 201, 227, 254, 284, 314, 346, 380, 415, 452, 491, 531, 573, 616, 661, 707, 755, 804, 855, 908, 962, 1018, 1075, 1134, 1195, 1257, 1320, 1385, 1452, 1521 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

Round( (Pi/4) * n^2 )

EXAMPLE

a(3)=7, since 3^2*Pi/4 = 7.06858347.

CROSSREFS

Approximation for A051233.

Sequence in context: A194581 A106080 A014283 * A022777 A033154 A076950

Adjacent sequences:  A033548 A033549 A033550 * A033552 A033553 A033554

KEYWORD

easy,nonn

AUTHOR

Joe K. Crump (joecr(AT)carolina.rr.com)

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.