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A077169 Initial terms of rows of A077168. 4
1, 2, 4, 7, 11, 15, 20, 26, 33, 41, 50, 60, 71, 83, 96, 110, 125, 141, 158, 176, 195, 215, 236, 258, 281, 305, 330, 356, 383, 411, 440, 470, 501, 533, 566, 600, 635, 671, 708, 746, 785, 825, 866, 908, 951, 995, 1040, 1086, 1133, 1181, 1230, 1280, 1331, 1383 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..53.

FORMULA

For n>3, a(n) = (n^2-n+10)/2.

CROSSREFS

Cf. A077168, A077170.

Sequence in context: A036700 A025719 A025696 * A094277 A263995 A261878

Adjacent sequences:  A077166 A077167 A077168 * A077170 A077171 A077172

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Nov 01 2002

EXTENSIONS

More terms from Sascha Kurz, Feb 10 2003

STATUS

approved

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Last modified December 6 06:58 EST 2016. Contains 278775 sequences.