login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A045756 as a simple table

na(n)
01
11
210
3190
45320
5196840
69054640
7498005200
831872332800
92326680294400
10190787784140800
1117361688356812800
121736168835681280000
13189242403089259520000
1422330603564532623360000
152835986652695643166720000
16385694184766607470673920000
1755925656791158083247718400000

[1,1,10,190,5320,196840,9054640,498005200,
 31872332800,2326680294400,190787784140800,
 17361688356812800,1736168835681280000,
 189242403089259520000,22330603564532623360000,
 2835986652695643166720000,
 385694184766607470673920000,
 55925656791158083247718400000]