Number of Ferrers diagrams with a single Ferrers puncture with the same orientation inscribed strictly inside with half-perimeter = n.

A133106

Number of Ferrers diagrams with a single Ferrers puncture with the same orientation inscribed strictly inside with half-perimeter = n.

Terms

    a(0) =1a(1) =8a(2) =41a(3) =168a(4) =602a(5) =1968a(6) =6021a(7) =17512a(8) =48950a(9) =132496a(10) =349258a(11) =900368a(12) =2277556a(13) =5667936a(14) =13906221a(15) =33695208a(16) =80746846a(17) =191601872a(18) =450642654a(19) =1051472048a(20) =2435679852a(21) =5605044640a(22) =12820922530a(23) =29164511376a(24) =66004709148a(25) =148678206880

External references