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A255550
Main diagonal of array A255551.
7
2, 5, 39, 91, 199, 315, 567, 829, 1227, 1513, 1953, 2569, 3277, 3769, 5119, 5925, 6607, 7539, 8319, 9375, 11007, 12511, 14103, 15801, 17593, 19165, 22213, 23617, 25467, 26967, 29347, 32733, 35809, 38085, 40953, 42915, 49093, 51787, 54055, 57459, 60409, 64057, 68433, 71637, 76299, 79719, 82545, 86133, 94921, 98037, 102745
OFFSET
1,1
COMMENTS
Equally, 2 followed by the first subdiagonal of A255543.
FORMULA
a(n) = A255551(n,n).
a(1) = 2; for n > 1: a(n) = A255543(n,n-1).
Other identities.
For all n >= 1, a(n) = A255553(A083141(n)).
PROG
(Scheme, two variants)
(define (A255550 n) (if (= 1 n) 2 (A255543bi n (- n 1)))) ;; A255543bi is given in A255543.
(define (A255550v2 n) (A255551bi n n)) ;; A255551bi is given in A255551.
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Feb 26 2015
STATUS
approved