Number of (undirected) paths in the n-book graph.

Terms

a(0) =12a(1) =49a(2) =136a(3) =297a(4) =556a(5) =937a(6) =1464a(7) =2161a(8) =3052a(9) =4161a(10) =5512a(11) =7129a(12) =9036a(13) =11257a(14) =13816a(15) =16737a(16) =20044a(17) =23761a(18) =27912a(19) =32521a(20) =37612a(21) =43209a(22) =49336a(23) =56017a(24) =63276a(25) =71137a(26) =79624a(27) =88761a(28) =98572a(29) =109081