Main diagonal of triangle A121400; also equals the partial sums of column 0 (A121399) of the same triangle.

A121398

Main diagonal of triangle A121400; also equals the partial sums of column 0 (A121399) of the same triangle.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =11a(4) =28a(5) =70a(6) =184a(7) =486a(8) =1313a(9) =3576a(10) =9851a(11) =27319a(12) =76286a(13) =214120a(14) =603858a(15) =1709719a(16) =4857959a(17) =13845948a(18) =39572583a(19) =113380652a(20) =325576692a(21) =936796592a(22) =2700456452a(23) =7797587816a(24) =22550434989a(25) =65308288346a(26) =189388557677

External references