Number of Ferrers diagrams with a single strictly smaller Ferrers puncture with the same orientation removed from the top with half-perimeter = n.

A133107

Number of Ferrers diagrams with a single strictly smaller Ferrers puncture with the same orientation removed from the top with half-perimeter = n.

Terms

    a(0) =1a(1) =7a(2) =32a(3) =121a(4) =410a(5) =1294a(6) =3888a(7) =11273a(8) =31826a(9) =88041a(10) =239734a(11) =644758a(12) =1717191a(13) =4538129a(14) =11919760a(15) =31156313a(16) =81125827a(17) =210604604a(18) =545462798a(19) =1410226551a(20) =3641097828a(21) =9391872711a(22) =24208902420a(23) =62373915102a(24) =160663604377

External references