A081612 First column of A082827.

1, 2, 3, 5, 8, 13, 18, 24, 31, 39, 49, 59, 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

Offset

1,2

Links

Table of n, a(n) for n=1..54.

Formula

For 13 <= n < 145, a(n) = (n^2 - 3n + 12)/2. For 145 <= n < 17975, a(n) = (n^2 - 3n + 14)/2. - David Wasserman, Oct 07 2004

Crossrefs

Cf. A082827, A082828.

Sequence in context: A308869 A001149 A144117 * A343484 A374737 A301754

Adjacent sequences: A081609 A081610 A081611 * A081613 A081614 A081615

Keyword

base,easy,nonn

Author

Amarnath Murthy, Apr 22 2003

Extensions

Corrected and extended by David Wasserman, Oct 07 2004

Status

approved