A061315 Array read by antidiagonals: T(n,k)=T(n,k-1)*(T(n,k-1)+k-1)/k with T(n,1)=n.

1, 1, 2, 1, 3, 3, 1, 5, 6, 4, 1, 10, 16, 10, 5, 1, 28, 76, 40, 15, 6, 1, 154, 1216, 430, 85, 21, 7, 1, 3520, 247456, 37324, 1870, 161, 28, 8, 1, 1551880

Offset

1,3

Comments

Not always an integer

Links

Table of n, a(n) for n=1..38.

Formula

a(n) =A061314(n, k-1)/k

Example

1,1,1,1,1,1,1,1,1,1,...
2,3,5,10,28,154,3520,1551880,267593772160,7160642690122633501504,...
3,6,16,76,1216,247456,61235956672/7,468730299066952899064/49,...
4,10,40,430,37324,232211266,7703153350084336,7417321441864447837991470393906,
5,15,85,1870,700876,81871778626,957569733696568731376,...
6,21,161,6601,8719921,12672844307641,22942997549397847673832961,...
7,28,280,19810,78503068,1027122012987994,...

Crossrefs

Rows include A000012 and A003504. Columns include A000027, A000217, A006007, A061319 and A061321.

Sequence in context: A207330 A048600 A100578 * A144265 A209416 A122075

Adjacent sequences: A061312 A061313 A061314 * A061316 A061317 A061318

Keyword

nonn,tabl

Author

Henry Bottomley, Apr 24 2001

Status

approved