A153804 a(n) = A153801(n)/2.

0, 0, 0, 0, 1, 2, 1, 6, 19, 30, 38, 45, 240, 282, 616, 1075, 1111, 1578, 2093, 2176, 4808, 4931, 5565, 9924, 10802, 11554, 22197, 43068, 55197, 65968, 107982, 378354, 429648, 628824, 699060, 1488035, 1510610, 3486215, 6733375, 10497919, 12018202, 12982385, 15201133

Offset

1,6

Links

Table of n, a(n) for n=1..43.

Formula

a(n) = (A000043(n) - A000040(n))/2.

Crossrefs

Cf. A000040, A000043, A153800, A153801, A153802.

Sequence in context: A366356 A365109 A025271 * A239740 A371986 A268371

Adjacent sequences: A153801 A153802 A153803 * A153805 A153806 A153807

Keyword

nonn

Author

Omar E. Pol, Jan 13 2009

Extensions

More terms from R. J. Mathar, Mar 14 2009

More terms from Jinyuan Wang, Mar 02 2020

Status

approved