Number of different fixed (possibly) disconnected trominoes bounded (not necessarily tightly) by an n*n square.

A162673

Number of different fixed (possibly) disconnected trominoes bounded (not necessarily tightly) by an n*n square.

Terms

    a(0) =0a(1) =4a(2) =48a(3) =204a(4) =580a(5) =1320a(6) =2604a(7) =4648a(8) =7704a(9) =12060a(10) =18040a(11) =26004a(12) =36348a(13) =49504a(14) =65940a(15) =86160a(16) =110704a(17) =140148a(18) =175104a(19) =216220a(20) =264180a(21) =319704a(22) =383548a(23) =456504a(24) =539400a(25) =633100a(26) =738504a(27) =856548a(28) =988204a(29) =1134480

External references