Number of Bottleneck-Monge matrices with 2 rows. In the formula below, P = 2.

Terms

a(0) =4a(1) =12a(2) =33a(3) =87a(4) =223a(5) =559a(6) =1375a(7) =3327a(8) =7935a(9) =18687a(10) =43519a(11) =100351a(12) =229375a(13) =520191a(14) =1171455a(15) =2621439a(16) =5832703a(17) =12910591a(18) =28442623a(19) =62390271a(20) =136314879a(21) =296747007a(22) =643825663a(23) =1392508927a(24) =3003121663a(25) =6459228159a(26) =13857980415a(27) =29662117887a(28) =63350767615