A091357 Number of planar partitions of n with exactly 3 rows.

1, 2, 5, 11, 22, 42, 78, 138, 239, 405, 669, 1088, 1741, 2744, 4267, 6564, 9975, 15019, 22394, 33111, 48549, 70678, 102127, 146636, 209186, 296697, 418401, 586985, 819218, 1137962, 1573336, 2165888, 2968914, 4053563, 5512820, 7469989

Offset: 3

Author

Christian G. Bower, Jan 02 2004

Keywords

• nonn

Crossrefs

Column 3 of A091355.

Cf. A000219, A089924, A091356-A091360.

Formula

a(n) = A000991(n)-A000990(n).