A185056 Number of ways to place n nonattacking composite pieces bishop + semi-rook on an n X n board.

1, 2, 5, 24, 125, 796, 5635, 48042, 453947, 4834872, 56433455, 727449366, 10099103269, 152097526360, 2449915208271, 42295879864692

Offset

1,2

Comments

Two semi-rooks do not attack each other if they are in the same column.

Links

Table of n, a(n) for n=1..16.

V. Kotesovec, Non-attacking chess pieces

Crossrefs

Cf. A088789, A187235, A002465, A099152, A000170.

Sequence in context: A374621 A052111 A176473 * A346204 A330512 A194349

Adjacent sequences: A185053 A185054 A185055 * A185057 A185058 A185059

Keyword

nonn,hard

Author

Vaclav Kotesovec, Dec 22 2011

Status

approved