login

A051880 as a simple table

na(n)
01
115
275
3245
4630
51386
62730
74950
88415
913585
1021021
1131395
1245500
1364260
1488740
15120156
16159885
17209475
18270655
19345345
20435666
21543950
22672750
23824850
241003275
251211301
261452465
271730575
282049720
292414280
302828936
313298680
323828825
334425015
345093235

[1,15,75,245,630,1386,2730,4950,8415,13585,21021,
 31395,45500,64260,88740,120156,159885,209475,
 270655,345345,435666,543950,672750,824850,1003275,
 1211301,1452465,1730575,2049720,2414280,2828936,
 3298680,3828825,4425015,5093235]