A065229 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the pentagonal numbers. The first elements of the rows form a(n).

1, 1, 3, 1, 5, 10, 4, 11, 19, 6, 16, 27, 4, 17, 31, 46, 11, 28, 46, 65, 15, 36, 58, 81, 13, 38, 64, 91, 2, 31, 61, 92, 124, 12, 46, 81, 117, 154, 16, 55, 95, 136, 178, 11, 55, 100, 146, 193, 241, 43, 93, 144, 196, 249, 16, 71, 127, 184, 242, 301, 31, 92, 154, 217, 281, 346

Offset

0,3

Links

Table of n, a(n) for n=0..65.

Crossrefs

Cf. A064766, A064865, A065221-A065228, A065230-A065223.

Sequence in context: A228781 A103327 A177463 * A233037 A275999 A286910

Adjacent sequences: A065226 A065227 A065228 * A065230 A065231 A065232

Keyword

easy,nonn

Author

Floor van Lamoen, Oct 22 2001

Status

approved