|
Search: id:A039671
|
|
|
| A039671 |
|
Row sums up to the main diagonal of the "postage stamp" array (n,m >= 0) defined in A007059. |
|
+0
1
|
|
| 1, 1, 3, 8, 21, 53, 130, 310, 724, 1661, 3757, 8398, 18588, 40800, 88918, 192592, 414907, 889631, 1899554, 4040864, 8567342, 18109698, 38176280, 80278798, 168432854, 352658013, 736977583, 1537420460, 3202035086, 6658948608
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
EXAMPLE
|
a(0)=1, a(1)=0+1=1, a(2)=0+1+2=3, a(3)=0+1+3+4=8
|
|
MATHEMATICA
|
f[ n_, m_ ] := f[ n, m ]=Which[ n>0, Sum[ f[ n-i, m ], {i, 1, m} ], n<0, 0, n==0, 1 ] Table[ Sum[ f[ n, j ], {j, 0, n} ], {n, 0, 30} ]
|
|
CROSSREFS
|
Cf. A007059.
Sequence in context: A096770 A007835 A014396 this_sequence A027930 A038200 A030015
Adjacent sequences: A039668 A039669 A039670 this_sequence A039672 A039673 A039674
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Richard L. Ollerton and Eirwyn L. Ollerton (r.ollerton(AT)uws.edu.au)
|
|
|
Search completed in 0.002 seconds
|
