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A035253 Second differences are 2,2,1,2,1,1,2,1,1,1,2,1,1,1,1,2,1,1,1,1,1,2,.. (A035214). 2
4, 1, 0, 1, 3, 7, 12, 18, 26, 35, 45, 56, 69, 83, 98, 114, 131, 150, 170, 191, 213, 236, 260, 286, 313, 341, 370, 400, 431, 463, 497, 532, 568, 605, 643, 682, 722, 763, 806, 850, 895, 941, 988, 1036, 1085, 1135 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..45.

CROSSREFS

Different from A005228. Cf. A035254.

Sequence in context: A213027 A290459 A290458 * A070432 A170989 A290457

Adjacent sequences:  A035250 A035251 A035252 * A035254 A035255 A035256

KEYWORD

nonn,easy

AUTHOR

Robet Bronson (bob(AT)bronsons.com)

STATUS

approved

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Last modified January 22 18:28 EST 2019. Contains 319365 sequences. (Running on oeis4.)